diff --git a/app/client/components/BookOverviewTabs.tsx b/app/client/components/BookOverviewTabs.tsx
index 738f5f4..f8551e1 100644
--- a/app/client/components/BookOverviewTabs.tsx
+++ b/app/client/components/BookOverviewTabs.tsx
@@ -3,10 +3,12 @@ import { Link } from '@tanstack/react-router';
 
 export function BookOverviewTabs({
   bookId,
-  currentTab
+  currentTab,
+  isAuthor
 }: {
   readonly bookId: string;
-  readonly currentTab: 'contents' | 'reviews';
+  readonly currentTab: 'contents' | 'reviews' | 'details';
+  readonly isAuthor: boolean;
 }) {
   return (
     <Tabs.Root defaultValue="members" value={currentTab}>
@@ -17,6 +19,11 @@ export function BookOverviewTabs({
         <Link to={`/work/book/${bookId}/overview/reviews`}>
           <Tabs.Trigger value="reviews">Reviews</Tabs.Trigger>
         </Link>
+        {isAuthor && (
+          <Link to={`/work/book/${bookId}/overview/details`}>
+            <Tabs.Trigger value="details">Details</Tabs.Trigger>
+          </Link>
+        )}
       </Tabs.List>
     </Tabs.Root>
   );
diff --git a/app/client/main.tsx b/app/client/main.tsx
index ebce8f8..3c16175 100644
--- a/app/client/main.tsx
+++ b/app/client/main.tsx
@@ -1,7 +1,7 @@
 import { ApolloClient, ApolloProvider, HttpLink, InMemoryCache, from } from '@apollo/client';
 import { loadDevMessages, loadErrorMessages } from '@apollo/client/dev';
 import { onError } from '@apollo/client/link/error';
-import { Box, Center, Spinner } from '@chakra-ui/react';
+import { Box, Center, Spinner, Stack } from '@chakra-ui/react';
 import '@client/assets/styles/index.css';
 import '@client/assets/styles/nerd-fonts-icons.css';
 import { Provider as ChakraProvider } from '@client/components/ui/provider';
@@ -118,7 +118,9 @@ function App() {
         <ApolloProvider client={client}>
           <ChakraProvider>
             <Toaster />
-            <RouterProviderWrapper authHeaders={authHeaders} />
+            <Stack maxWidth="100vw">
+              <RouterProviderWrapper authHeaders={authHeaders} />
+            </Stack>
           </ChakraProvider>
         </ApolloProvider>
       </AuthProvider>
diff --git a/app/client/pages/profile/$username.tsx b/app/client/pages/profile/$username.tsx
index f53d5af..ef20109 100644
--- a/app/client/pages/profile/$username.tsx
+++ b/app/client/pages/profile/$username.tsx
@@ -1,4 +1,5 @@
-import { createFileRoute } from '@tanstack/react-router';
+import {Stack} from '@chakra-ui/react';
+import {createFileRoute} from '@tanstack/react-router';
 
 export const Route = createFileRoute('/profile/$username')({
   component: RouteComponent
@@ -6,5 +7,5 @@ export const Route = createFileRoute('/profile/$username')({
 
 function RouteComponent() {
   const { username } = Route.useParams();
-  return <div>{`Hello, "${username}"!`}</div>;
+  return <Stack>{`Hello, "${username}"!`}</Stack>;
 }
diff --git a/app/client/pages/work/book/$bookId/overview/contents.tsx b/app/client/pages/work/book/$bookId/overview/contents.tsx
index fdb37ac..408f1a5 100644
--- a/app/client/pages/work/book/$bookId/overview/contents.tsx
+++ b/app/client/pages/work/book/$bookId/overview/contents.tsx
@@ -32,10 +32,14 @@ function RouteComponent() {
 
   return (
     <>
-      <BookOverviewTabs bookId={id} currentTab="contents" />
-
       {data != null ? (
         <>
+          <BookOverviewTabs
+            isAuthor={data?.bookOne.author.id === identity?.data.id}
+            bookId={id}
+            currentTab="contents"
+          />
+
           <BookChapterList
             id={data.bookOne.id}
             isAuthor={identity?.data.id === data.bookOne.author.id}
diff --git a/app/client/pages/work/book/$bookId/overview/details.tsx b/app/client/pages/work/book/$bookId/overview/details.tsx
new file mode 100644
index 0000000..5216445
--- /dev/null
+++ b/app/client/pages/work/book/$bookId/overview/details.tsx
@@ -0,0 +1,151 @@
+import { gql, useQuery } from '@apollo/client';
+import { BookOverviewTabs } from '@app/client/components/BookOverviewTabs';
+import { bookListQuery } from '@app/client/components/BookSearchList';
+import { bookFragment } from '@app/client/fragments';
+import { useIdentity } from '@app/client/hooks/identity';
+import { useToastMutation } from '@app/client/hooks/useToastMutation';
+import { Button, Input, NativeSelect, Skeleton, Stack, Textarea } from '@chakra-ui/react';
+import { BookDetailsQuery, WorkingProgressStatus } from '@generated/types';
+import { useNavigate } from '@tanstack/react-router';
+import { createFileRoute } from '@tanstack/react-router';
+import { useState } from 'react';
+
+export const Route = createFileRoute('/work/book/$bookId/overview/details')({
+  component: RouteComponent
+});
+
+function RouteComponent() {
+  const { bookId: id } = Route.useParams();
+
+  const identity = useIdentity();
+
+  const navigate = useNavigate();
+
+  const { data } = useQuery<BookDetailsQuery>(bookQuery, {
+    variables: { id }
+  });
+
+  const { update: bookUpdate } = useToastMutation({
+    mutation: bookUpdateMutation,
+    successMsg: 'Book updated successfully'
+  });
+
+  const { update: bookDelete } = useToastMutation({
+    mutation: bookDeleteMutation,
+    successMsg: 'Book deleted successfully',
+    refetchQueries: [bookListQuery]
+  });
+
+  const [title, setTitle] = useState<string | undefined>(data?.bookOne.title);
+  const [description, setDescription] = useState<string | undefined>(data?.bookOne.description);
+
+  const [progress, setProgress] = useState<WorkingProgressStatus | undefined>(
+    data?.bookOne.progressStatus
+  );
+
+  if (data == null) return <Skeleton />;
+
+  return (
+    <>
+      <BookOverviewTabs
+        isAuthor={data.bookOne.author.id === identity?.data.id}
+        bookId={id}
+        currentTab="details"
+      />
+      <Stack justifyContent="center" alignItems="center">
+        <Stack width="70%">
+          <Input
+            value={title}
+            onChange={event => setTitle(event.currentTarget.value)}
+            placeholder="title"
+            maxLength={60}
+          />
+
+          <NativeSelect.Root>
+            <NativeSelect.Field
+              value={progress}
+              onChange={event => {
+                const updatedStatus = event.currentTarget.value;
+                ensureProgressStatus(updatedStatus);
+                setProgress(updatedStatus);
+              }}
+            >
+              <option value={WorkingProgressStatus.InProgress}>In progress</option>
+              <option value={WorkingProgressStatus.Frozen}>Frozen</option>
+              <option value={WorkingProgressStatus.Complete}>Complete</option>
+            </NativeSelect.Field>
+            <NativeSelect.Indicator />
+          </NativeSelect.Root>
+          <Textarea
+            value={description}
+            onChange={event => setDescription(event.currentTarget.value)}
+            placeholder="description"
+            maxLength={500}
+            autoresize
+          />
+
+          <Button
+            width="100%"
+            onClick={async () => {
+              await bookUpdate({
+                variables: {
+                  input: {
+                    id,
+                    title,
+                    description,
+                    progressStatus: progress
+                  }
+                }
+              });
+            }}
+          >
+            Update
+          </Button>
+
+          <Button
+            width="100%"
+            backgroundColor="red.500"
+            onClick={async () => {
+              await bookDelete({ variables: { id } });
+              navigate({ to: '/' });
+            }}
+          >
+            Delete
+          </Button>
+        </Stack>
+      </Stack>
+    </>
+  );
+}
+
+function ensureProgressStatus(value: string): asserts value is WorkingProgressStatus {
+  if (value === WorkingProgressStatus.Complete) return;
+  if (value === WorkingProgressStatus.InProgress) return;
+  if (value === WorkingProgressStatus.Frozen) return;
+
+  throw new Error('Invalid WorkingPrgoressStatus');
+}
+
+const bookQuery = gql`
+  query BookDetails($id: ID!) {
+    bookOne(id: $id) {
+      ...Book
+    }
+  }
+  ${bookFragment}
+`;
+
+const bookUpdateMutation = gql`
+  mutation BookDetailsUpdate($input: BookUpdateInput!) {
+    bookUpdate(input: $input) {
+      ...Book
+    }
+  }
+  ${bookFragment}
+`;
+
+const bookDeleteMutation = gql`
+  mutation BookDetailsDelete($id: ID!) {
+    bookDelete(id: $id)
+  }
+`;
diff --git a/app/client/pages/work/book/$bookId/overview/reviews.tsx b/app/client/pages/work/book/$bookId/overview/reviews.tsx
index 4e34b62..faaccf1 100644
--- a/app/client/pages/work/book/$bookId/overview/reviews.tsx
+++ b/app/client/pages/work/book/$bookId/overview/reviews.tsx
@@ -1,4 +1,4 @@
-import { gql } from '@apollo/client';
+import { gql, useQuery } from '@apollo/client';
 import { BookOverviewTabs } from '@app/client/components/BookOverviewTabs';
 import { Pagination } from '@app/client/components/Pagination';
 import { reviewFragment } from '@app/client/fragments';
@@ -6,7 +6,7 @@ import { useIdentity } from '@app/client/hooks/identity';
 import { usePaginatedQuery } from '@app/client/hooks/usePaginatedQuery';
 import { useToastMutation } from '@app/client/hooks/useToastMutation';
 import { Skeleton, Stack, Text } from '@chakra-ui/react';
-import { BookReviewCreateMutation, BookReviewsQuery } from '@generated/types';
+import { BookReviewCreateMutation, BookReviewsDataQuery, BookReviewsQuery } from '@generated/types';
 import { createFileRoute } from '@tanstack/react-router';
 import { useState } from 'react';
 import { bookQuery } from '../overview';
@@ -36,17 +36,25 @@ function RouteComponent() {
     }
   });
 
+  const { data: authorData } = useQuery<BookReviewsDataQuery>(bookAuthorQuery, {
+    variables: { id }
+  });
+
   const { update: reviewCreate } = useToastMutation<BookReviewCreateMutation>({
     mutation: bookReviewCreateMutation,
     successMsg: 'Review posted!',
     refetchQueries: [bookReviewsQuery, bookQuery]
   });
 
-  if (data == null) return <Skeleton />;
+  if (data == null || authorData == null) return <Skeleton />;
 
   return (
     <>
-      <BookOverviewTabs bookId={id} currentTab="reviews" />
+      <BookOverviewTabs
+        isAuthor={authorData.bookOne.author.id === identity?.data.id}
+        bookId={id}
+        currentTab="reviews"
+      />
 
       {identity != null && reviewsPage === 1 && (
         <ReviewInput
@@ -97,6 +105,17 @@ function RouteComponent() {
   );
 }
 
+const bookAuthorQuery = gql`
+  query BookReviewsData($id: ID!) {
+    bookOne(id: $id) {
+      id
+      author {
+        id
+      }
+    }
+  }
+`;
+
 const bookReviewsQuery = gql`
   query BookReviews($input: ReviewManyInput!) {
     reviewMany(input: $input) {
diff --git a/app/client/routeTree.gen.ts b/app/client/routeTree.gen.ts
index 8874198..b731e4f 100644
--- a/app/client/routeTree.gen.ts
+++ b/app/client/routeTree.gen.ts
@@ -20,6 +20,7 @@ import { Route as ProfileUsernameImport } from './pages/profile/$username'
 import { Route as NewBookImport } from './pages/new/book'
 import { Route as WorkBookBookIdOverviewImport } from './pages/work/book/$bookId/overview'
 import { Route as WorkBookBookIdOverviewReviewsImport } from './pages/work/book/$bookId/overview/reviews'
+import { Route as WorkBookBookIdOverviewDetailsImport } from './pages/work/book/$bookId/overview/details'
 import { Route as WorkBookBookIdOverviewContentsImport } from './pages/work/book/$bookId/overview/contents'
 import { Route as WorkBookBookIdChapterNewImport } from './pages/work/book/$bookId/chapter/new'
 import { Route as WorkBookBookIdChapterChapterIdViewImport } from './pages/work/book/$bookId/chapter/$chapterId/view'
@@ -82,6 +83,13 @@ const WorkBookBookIdOverviewReviewsRoute =
     getParentRoute: () => WorkBookBookIdOverviewRoute,
   } as any)
 
+const WorkBookBookIdOverviewDetailsRoute =
+  WorkBookBookIdOverviewDetailsImport.update({
+    id: '/details',
+    path: '/details',
+    getParentRoute: () => WorkBookBookIdOverviewRoute,
+  } as any)
+
 const WorkBookBookIdOverviewContentsRoute =
   WorkBookBookIdOverviewContentsImport.update({
     id: '/contents',
@@ -183,6 +191,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof WorkBookBookIdOverviewContentsImport
       parentRoute: typeof WorkBookBookIdOverviewImport
     }
+    '/work/book/$bookId/overview/details': {
+      id: '/work/book/$bookId/overview/details'
+      path: '/details'
+      fullPath: '/work/book/$bookId/overview/details'
+      preLoaderRoute: typeof WorkBookBookIdOverviewDetailsImport
+      parentRoute: typeof WorkBookBookIdOverviewImport
+    }
     '/work/book/$bookId/overview/reviews': {
       id: '/work/book/$bookId/overview/reviews'
       path: '/reviews'
@@ -211,12 +226,14 @@ declare module '@tanstack/react-router' {
 
 interface WorkBookBookIdOverviewRouteChildren {
   WorkBookBookIdOverviewContentsRoute: typeof WorkBookBookIdOverviewContentsRoute
+  WorkBookBookIdOverviewDetailsRoute: typeof WorkBookBookIdOverviewDetailsRoute
   WorkBookBookIdOverviewReviewsRoute: typeof WorkBookBookIdOverviewReviewsRoute
 }
 
 const WorkBookBookIdOverviewRouteChildren: WorkBookBookIdOverviewRouteChildren =
   {
     WorkBookBookIdOverviewContentsRoute: WorkBookBookIdOverviewContentsRoute,
+    WorkBookBookIdOverviewDetailsRoute: WorkBookBookIdOverviewDetailsRoute,
     WorkBookBookIdOverviewReviewsRoute: WorkBookBookIdOverviewReviewsRoute,
   }
 
@@ -236,6 +253,7 @@ export interface FileRoutesByFullPath {
   '/work/book/$bookId/overview': typeof WorkBookBookIdOverviewRouteWithChildren
   '/work/book/$bookId/chapter/new': typeof WorkBookBookIdChapterNewRoute
   '/work/book/$bookId/overview/contents': typeof WorkBookBookIdOverviewContentsRoute
+  '/work/book/$bookId/overview/details': typeof WorkBookBookIdOverviewDetailsRoute
   '/work/book/$bookId/overview/reviews': typeof WorkBookBookIdOverviewReviewsRoute
   '/work/book/$bookId/chapter/$chapterId/edit': typeof WorkBookBookIdChapterChapterIdEditRoute
   '/work/book/$bookId/chapter/$chapterId/view': typeof WorkBookBookIdChapterChapterIdViewRoute
@@ -252,6 +270,7 @@ export interface FileRoutesByTo {
   '/work/book/$bookId/overview': typeof WorkBookBookIdOverviewRouteWithChildren
   '/work/book/$bookId/chapter/new': typeof WorkBookBookIdChapterNewRoute
   '/work/book/$bookId/overview/contents': typeof WorkBookBookIdOverviewContentsRoute
+  '/work/book/$bookId/overview/details': typeof WorkBookBookIdOverviewDetailsRoute
   '/work/book/$bookId/overview/reviews': typeof WorkBookBookIdOverviewReviewsRoute
   '/work/book/$bookId/chapter/$chapterId/edit': typeof WorkBookBookIdChapterChapterIdEditRoute
   '/work/book/$bookId/chapter/$chapterId/view': typeof WorkBookBookIdChapterChapterIdViewRoute
@@ -269,6 +288,7 @@ export interface FileRoutesById {
   '/work/book/$bookId/overview': typeof WorkBookBookIdOverviewRouteWithChildren
   '/work/book/$bookId/chapter/new': typeof WorkBookBookIdChapterNewRoute
   '/work/book/$bookId/overview/contents': typeof WorkBookBookIdOverviewContentsRoute
+  '/work/book/$bookId/overview/details': typeof WorkBookBookIdOverviewDetailsRoute
   '/work/book/$bookId/overview/reviews': typeof WorkBookBookIdOverviewReviewsRoute
   '/work/book/$bookId/chapter/$chapterId/edit': typeof WorkBookBookIdChapterChapterIdEditRoute
   '/work/book/$bookId/chapter/$chapterId/view': typeof WorkBookBookIdChapterChapterIdViewRoute
@@ -287,6 +307,7 @@ export interface FileRouteTypes {
     | '/work/book/$bookId/overview'
     | '/work/book/$bookId/chapter/new'
     | '/work/book/$bookId/overview/contents'
+    | '/work/book/$bookId/overview/details'
     | '/work/book/$bookId/overview/reviews'
     | '/work/book/$bookId/chapter/$chapterId/edit'
     | '/work/book/$bookId/chapter/$chapterId/view'
@@ -302,6 +323,7 @@ export interface FileRouteTypes {
     | '/work/book/$bookId/overview'
     | '/work/book/$bookId/chapter/new'
     | '/work/book/$bookId/overview/contents'
+    | '/work/book/$bookId/overview/details'
     | '/work/book/$bookId/overview/reviews'
     | '/work/book/$bookId/chapter/$chapterId/edit'
     | '/work/book/$bookId/chapter/$chapterId/view'
@@ -317,6 +339,7 @@ export interface FileRouteTypes {
     | '/work/book/$bookId/overview'
     | '/work/book/$bookId/chapter/new'
     | '/work/book/$bookId/overview/contents'
+    | '/work/book/$bookId/overview/details'
     | '/work/book/$bookId/overview/reviews'
     | '/work/book/$bookId/chapter/$chapterId/edit'
     | '/work/book/$bookId/chapter/$chapterId/view'
@@ -401,6 +424,7 @@ export const routeTree = rootRoute
       "filePath": "work/book/$bookId/overview.tsx",
       "children": [
         "/work/book/$bookId/overview/contents",
+        "/work/book/$bookId/overview/details",
         "/work/book/$bookId/overview/reviews"
       ]
     },
@@ -411,6 +435,10 @@ export const routeTree = rootRoute
       "filePath": "work/book/$bookId/overview/contents.tsx",
       "parent": "/work/book/$bookId/overview"
     },
+    "/work/book/$bookId/overview/details": {
+      "filePath": "work/book/$bookId/overview/details.tsx",
+      "parent": "/work/book/$bookId/overview"
+    },
     "/work/book/$bookId/overview/reviews": {
       "filePath": "work/book/$bookId/overview/reviews.tsx",
       "parent": "/work/book/$bookId/overview"
diff --git a/app/server/graphql/graphql.ts b/app/server/graphql/graphql.ts
index 21296a4..da01ab8 100644
--- a/app/server/graphql/graphql.ts
+++ b/app/server/graphql/graphql.ts
@@ -14,6 +14,8 @@ import { UserOneResolver } from './resolvers/userOneResolver';
 import { LoginResolver } from './resolvers/auth/login';
 import { LogoutResolver } from './resolvers/auth/logout';
 import { SignUpResolver } from './resolvers/auth/signUp';
+import { BookUpdateResolver } from './resolvers/bookUpdateResolver';
+import { BookDeleteResolver } from './resolvers/bookDeleteResolver';
 import { BookChapterCreateResolver } from './resolvers/bookChapterCreateResolver';
 import { BookChapterDeleteResolver } from './resolvers/bookChapterDelete';
 import { BookChapterUpdateResolver } from './resolvers/bookChapterUpdateResolver';
@@ -36,6 +38,8 @@ export const Mutation: MutationResolvers = {
   login: LoginResolver,
   logout: LogoutResolver,
   bookCreate: BookCreateResolver,
+  bookUpdate: BookUpdateResolver,
+  bookDelete: BookDeleteResolver,
   bookChapterCreate: BookChapterCreateResolver,
   bookChapterDelete: BookChapterDeleteResolver,
   bookChapterUpdate: BookChapterUpdateResolver,
diff --git a/app/server/graphql/resolvers/bookDeleteResolver.ts b/app/server/graphql/resolvers/bookDeleteResolver.ts
new file mode 100644
index 0000000..46a796f
--- /dev/null
+++ b/app/server/graphql/resolvers/bookDeleteResolver.ts
@@ -0,0 +1,22 @@
+import { ensureIdentity } from '@app/server/helpers';
+import { IdentityContext } from '@app/server/identity';
+import { prisma } from '@app/server/prisma/client';
+import { MutationBookDeleteArgs } from '@generated/types';
+
+export async function BookDeleteResolver(
+  _: any,
+  { id }: MutationBookDeleteArgs,
+  { identity }: IdentityContext
+): Promise<void> {
+  ensureIdentity(identity);
+
+  const model = await prisma.book.findUniqueOrThrow({
+    where: { id }
+  });
+
+  if (identity.id !== model.authorId) throw new Error('Operation is not permitted.');
+
+  await prisma.book.delete({
+    where: { id }
+  });
+}
diff --git a/app/server/graphql/resolvers/bookUpdateResolver.ts b/app/server/graphql/resolvers/bookUpdateResolver.ts
new file mode 100644
index 0000000..e969c18
--- /dev/null
+++ b/app/server/graphql/resolvers/bookUpdateResolver.ts
@@ -0,0 +1,34 @@
+import { ensureIdentity } from '@app/server/helpers';
+import { IdentityContext } from '@app/server/identity';
+import { prisma } from '@app/server/prisma/client';
+import { Book, MutationBookUpdateArgs } from '@generated/types';
+import { toBookSchema } from './mappers/bookMapper';
+
+export async function BookUpdateResolver(
+  _: any,
+  { input }: MutationBookUpdateArgs,
+  { req, res, identity }: IdentityContext
+): Promise<Book> {
+  ensureIdentity(identity);
+
+  const model = await prisma.book.findUniqueOrThrow({
+    where: { id: input.id }
+  });
+
+  if (identity.id !== model.authorId) throw new Error('Operation is not permitted.');
+
+  if (input.title != null && input.title.length > 60) throw new Error('Title is too long.');
+  if (input.description != null && input.description.length > 900)
+    throw new Error('Description is too long.');
+
+  const modelUpdated = await prisma.book.update({
+    where: { id: input.id },
+    data: {
+      title: input.title != null ? input.title : undefined,
+      description: input.description != null ? input.description : undefined,
+      progressStatus: input.progressStatus != null ? input.progressStatus : undefined
+    }
+  });
+
+  return toBookSchema(modelUpdated, { req, res, identity });
+}
diff --git a/app/server/graphql/schema.graphql b/app/server/graphql/schema.graphql
index f21a5c2..8aa55d3 100644
--- a/app/server/graphql/schema.graphql
+++ b/app/server/graphql/schema.graphql
@@ -16,6 +16,8 @@ type Mutation {
   login(input: LoginInput!): Session!
   logout: Void
   bookCreate(input: BookCreateInput!): Book!
+  bookUpdate(input: BookUpdateInput!): Book!
+  bookDelete(id: ID!): Void
   bookChapterCreate(input: BookChapterCreateInput!): BookChapter!
   bookChapterUpdate(input: BookChapterUpdateInput!): BookChapter!
   bookChapterDelete(id: ID!): Book!
@@ -97,7 +99,7 @@ type Book {
   personalRating: RatingType!
 }
 
-input BookUpdate {
+input BookUpdateInput {
   id: ID!
   title: String
   description: String
diff --git a/app/server/prisma/schema.prisma b/app/server/prisma/schema.prisma
index 695cbcd..5f1d237 100644
--- a/app/server/prisma/schema.prisma
+++ b/app/server/prisma/schema.prisma
@@ -74,7 +74,7 @@ model BookChapter {
 
   wordsTotal Int @default(0)
 
-  book   Book   @relation(fields: [bookId], references: [id])
+  book   Book   @relation(fields: [bookId], references: [id], onDelete: Cascade)
   bookId String @db.VarChar(255)
 
   reviews Review[]
@@ -94,10 +94,10 @@ model Review {
   user   User   @relation(fields: [userId], references: [id])
   userId String @db.VarChar(255)
 
-  bookChapter   BookChapter? @relation(fields: [bookChapterId], references: [id])
+  bookChapter   BookChapter? @relation(fields: [bookChapterId], references: [id], onDelete: Cascade)
   bookChapterId String?      @db.VarChar(255)
 
-  book   Book?   @relation(fields: [bookId], references: [id])
+  book   Book?   @relation(fields: [bookId], references: [id], onDelete: Cascade)
   bookId String?
 }