diff --git a/flask_library/.gitignore b/flask_library/.gitignore
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diff --git a/flask_library/app.py b/flask_library/app.py
new file mode 100644
index 0000000..cbc7ac5
--- /dev/null
+++ b/flask_library/app.py
@@ -0,0 +1,22 @@
+from flask import Flask
+from flask_restful import Api
+from models import db
+from controller import LibraryResource, LibraryListResource
+
+app = Flask(__name__)
+api = Api(app)
+
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+
+db.init_app(app)
+
+@app.before_request
+def create_tables():
+    db.create_all()
+
+api.add_resource(LibraryListResource, '/api/library')
+api.add_resource(LibraryResource, '/api/library/<string:isbn>')
+
+if __name__ == "__main__":
+    app.run(debug=True)
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diff --git a/flask_library/controller/__init__.py b/flask_library/controller/__init__.py
new file mode 100644
index 0000000..5c80529
--- /dev/null
+++ b/flask_library/controller/__init__.py
@@ -0,0 +1 @@
+from .library_controller import LibraryListResource, LibraryResource
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diff --git a/flask_library/controller/__pycache__/__init__.cpython-313.pyc b/flask_library/controller/__pycache__/__init__.cpython-313.pyc
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diff --git a/flask_library/controller/__pycache__/library_controller.cpython-313.pyc b/flask_library/controller/__pycache__/library_controller.cpython-313.pyc
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diff --git a/flask_library/controller/library_controller.py b/flask_library/controller/library_controller.py
new file mode 100644
index 0000000..3524342
--- /dev/null
+++ b/flask_library/controller/library_controller.py
@@ -0,0 +1,50 @@
+from flask_restful import Resource
+from flask import request
+from service import LibraryService
+from models import db
+
+class LibraryListResource(Resource):
+    def get(self):
+        books = LibraryService.get_all()
+        return [book.to_dict() for book in books], 200
+    
+    def post(self):
+        try:
+            data = request.get_json()
+
+            if 'isbn' not in data or 'title' not in data or 'author' not in data:
+                return {"message": "ISBN, title, and author are required"}, 400
+            
+            book = LibraryService.create(data)
+            return book.to_dict(), 201
+        except Exception as e:
+            db.session.rollback()
+            return {"message": "Unexpected error occurred", "details": str(e)}, 500
+        
+class LibraryResource(Resource):
+    def get(self, isbn):
+        book = LibraryService.get_by_id(isbn)
+        if not book:
+            return {"message": "Book not found"}, 404
+        return book.to_dict(), 200
+    
+    def put(self, isbn):
+        try:
+            data = request.get_json()
+            book = LibraryService.update(isbn, data)
+            if not book:
+                return {"message": "Book not found"}, 404
+            return book.to_dict(), 200
+        except Exception as e:
+            db.session.rollback()
+            return {"message": "Unexpected error occurred", "details": str(e)}, 500
+        
+    def delete(self, isbn):
+        try:
+            book = LibraryService.delete(isbn)
+            if not book:
+                return {"message": "Book not found"}, 404
+            return {"message": f"Book with ISBN {isbn} deleted"}, 200
+        except Exception as e:
+            db.session.rollback()
+            return {"message": "Unexpected error occurred", "details": str(e)}, 500
\ No newline at end of file
diff --git a/flask_library/instance/test.db b/flask_library/instance/test.db
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diff --git a/flask_library/models/__init__.py b/flask_library/models/__init__.py
new file mode 100644
index 0000000..2b42497
--- /dev/null
+++ b/flask_library/models/__init__.py
@@ -0,0 +1,5 @@
+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()
+
+from .library import Library
\ No newline at end of file
diff --git a/flask_library/models/__pycache__/__init__.cpython-313.pyc b/flask_library/models/__pycache__/__init__.cpython-313.pyc
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diff --git a/flask_library/models/__pycache__/library.cpython-313.pyc b/flask_library/models/__pycache__/library.cpython-313.pyc
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diff --git a/flask_library/models/library.py b/flask_library/models/library.py
new file mode 100644
index 0000000..b153110
--- /dev/null
+++ b/flask_library/models/library.py
@@ -0,0 +1,14 @@
+from . import db
+class Library(db.Model):
+    __tablename__ = 'library'
+
+    isbn = db.Column(db.String(13), primary_key=True)
+    title = db.Column(db.String(80), nullable=False)
+    author = db.Column(db.String(80), nullable=False)
+
+    def to_dict(self):
+        return {
+            "isbn": self.isbn,
+            "title": self.title,
+            "author": self.author
+        }
\ No newline at end of file
diff --git a/flask_library/repositories/__init__.py b/flask_library/repositories/__init__.py
new file mode 100644
index 0000000..9e068cd
--- /dev/null
+++ b/flask_library/repositories/__init__.py
@@ -0,0 +1 @@
+from .library_repository import LibraryRepository
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diff --git a/flask_library/repositories/__pycache__/__init__.cpython-313.pyc b/flask_library/repositories/__pycache__/__init__.cpython-313.pyc
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diff --git a/flask_library/repositories/__pycache__/library_repository.cpython-313.pyc b/flask_library/repositories/__pycache__/library_repository.cpython-313.pyc
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diff --git a/flask_library/repositories/library_repository.py b/flask_library/repositories/library_repository.py
new file mode 100644
index 0000000..aa695fc
--- /dev/null
+++ b/flask_library/repositories/library_repository.py
@@ -0,0 +1,39 @@
+from models import Library, db
+
+class LibraryRepository:
+    @staticmethod
+    def find_all():
+        return Library.query.all()
+    
+    @staticmethod
+    def find_by_id(isbn):
+        return Library.query.get(isbn)
+    
+    @staticmethod
+    def save(book):
+        db.session.add(book)
+        db.session.commit()
+        return book
+    
+    @staticmethod
+    def update(isbn, data: dict):
+        book = Library.query.get(isbn)
+        if not book:
+            return None
+        
+        for key, value in data.items():
+            if hasattr(book, key):
+                setattr(book, key, value)
+
+        db.session.commit()
+        return book
+    
+    @staticmethod
+    def delete(isbn):
+        book = Library.query.get(isbn)
+        if not book:
+            return None
+        
+        db.session.delete(book)
+        db.session.commit()
+        return book
\ No newline at end of file
diff --git a/flask_library/requirements.txt b/flask_library/requirements.txt
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diff --git a/flask_library/service/__init__.py b/flask_library/service/__init__.py
new file mode 100644
index 0000000..f6bf3ff
--- /dev/null
+++ b/flask_library/service/__init__.py
@@ -0,0 +1 @@
+from .library_service import LibraryService
\ No newline at end of file
diff --git a/flask_library/service/__pycache__/__init__.cpython-313.pyc b/flask_library/service/__pycache__/__init__.cpython-313.pyc
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diff --git a/flask_library/service/__pycache__/library_service.cpython-313.pyc b/flask_library/service/__pycache__/library_service.cpython-313.pyc
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diff --git a/flask_library/service/library_service.py b/flask_library/service/library_service.py
new file mode 100644
index 0000000..6a1df50
--- /dev/null
+++ b/flask_library/service/library_service.py
@@ -0,0 +1,27 @@
+from repositories import LibraryRepository
+from models import Library
+
+class LibraryService:
+    @staticmethod
+    def get_all():
+        return LibraryRepository.find_all()
+    
+    @staticmethod
+    def get_by_id(isbn):
+        return LibraryRepository.find_by_id(isbn)
+    
+    @staticmethod
+    def create(data):
+        book = Library(
+            isbn=data['isbn'],
+            title=data['title'],
+            author=data['author']
+        )
+        return LibraryRepository.save(book)
+    
+    @staticmethod
+    def update(isbn, data):
+        return LibraryRepository.update(isbn, data)
+    
+    def delete(isbn):
+        return LibraryRepository.delete(isbn)
\ No newline at end of file