diff --git a/api/routes/books.py b/api/routes/books.py
index 27a4ac81a..aa0250c15 100644
--- a/api/routes/books.py
+++ b/api/routes/books.py
@@ -64,13 +64,11 @@ async def delete_book(book_id: int) -> None:
 
 
 @router.get("/{book_id}", response_model=Book, status_code=status.HTTP_200_OK)
-async def get_book(book_id: int):
+async def get_book(book_id: int) -> Book:
     book = db.get_book(book_id)
-
     if not book:
         raise HTTPException(
             status_code=status.HTTP_404_NOT_FOUND,
-            detail=f"Book with ID {book_id} does not exist"
+            detail="Book not found"
         )
-
-    return book
+    return book
\ No newline at end of file