diff --git a/server/models/author.js b/server/models/author.js
new file mode 100644
index 0000000..34067b0
--- /dev/null
+++ b/server/models/author.js
@@ -0,0 +1,9 @@
+const mongoose = require('mongoose');
+const { Schema } = mongoose;
+
+const authorSchema = new Schema({
+  name: String,
+  age: Number
+});
+
+module.exports = mongoose.model('Author', authorSchema);
diff --git a/server/models/book.js b/server/models/book.js
new file mode 100644
index 0000000..62d5ece
--- /dev/null
+++ b/server/models/book.js
@@ -0,0 +1,10 @@
+const mongoose = require('mongoose');
+const { Schema } = mongoose;
+
+const bookSchema = new Schema({
+  name: String,
+  genre: String,
+  authorId: String
+});
+
+module.exports = mongoose.model('Book', bookSchema);
diff --git a/server/schema/schema.js b/server/schema/schema.js
index 9d4d7d2..1c0e87d 100644
--- a/server/schema/schema.js
+++ b/server/schema/schema.js
@@ -1,6 +1,3 @@
-const graphql = require('graphql');
-const _ = require('lodash');
-
 const {
   GraphQLObjectType,
   GraphQLString,
@@ -8,22 +5,11 @@ const {
   GraphQLInt,
   GraphQLList,
   GraphQLSchema
-} = graphql;
+} = require('graphql');
+const _ = require('lodash');
 
-// temp data
-const books = [
-  { name: 'Name of the Wind', genre: 'Fantasy', id: '1', authorId: '1' },
-  { name: 'The Final Empire', genre: 'Fantasy', id: '2', authorId: '2' },
-  { name: 'The Hero of Ages', genre: 'Fantasy', id: '4', authorId: '2' },
-  { name: 'The Long Earth', genre: 'Sci-Fi', id: '3', authorId: '3' },
-  { name: 'The Colour of Magic', genre: 'Fantasy', id: '5', authorId: '3' },
-  { name: 'The Light Fantastic', genre: 'Fantasy', id: '6', authorId: '3' }
-];
-const authors = [
-  { name: 'Patrick Rothfuss', age: 44, id: '1' },
-  { name: 'Brandon Sanderson', age: 42, id: '2' },
-  { name: 'Terry Pratchett', age: 66, id: '3' }
-];
+const Book = require('../models/book');
+const Author = require('../models/author');
 
 const BookType = new GraphQLObjectType({
   name: 'Book',
@@ -34,7 +20,7 @@ const BookType = new GraphQLObjectType({
     author: {
       type: AuthorType,
       resolve (parent, args) {
-        return _.find(authors, { id: parent.authorId });
+        // return _.find(authors, { id: parent.authorId });
       }
     }
   })
@@ -49,7 +35,7 @@ const AuthorType = new GraphQLObjectType({
     books: {
       type: new GraphQLList(BookType),
       resolve (parent, args) {
-        return _.filter(books, { authorId: parent.id });
+        // return _.filter(books, { authorId: parent.id });
       }
     }
   })
@@ -62,31 +48,68 @@ const RootQuery = new GraphQLObjectType({
       type: BookType,
       args: { id: { type: GraphQLID } },
       resolve (parent, args) {
-        return _.find(books, { id: args.id });
+        // return _.find(books, { id: args.id });
       }
     },
     author: {
       type: AuthorType,
       args: { id: { type: GraphQLID } },
       resolve (parent, args) {
-        return _.find(authors, { id: args.id });
+        // return _.find(authors, { id: args.id });
       }
     },
     books: {
       type: new GraphQLList(BookType),
       resolve (parent, args) {
-        return books;
+        // return books;
       }
     },
     authors: {
       type: new GraphQLList(AuthorType),
       resolve (parent, args) {
-        return authors;
+        // return authors;
+      }
+    }
+  }
+});
+
+const Mutation = new GraphQLObjectType({
+  name: 'Mutation',
+  fields: {
+    addAuthor: {
+      type: AuthorType,
+      args: {
+        name: { type: GraphQLString },
+        age: { type: GraphQLInt }
+      },
+      resolve (parent, { name, age }) {
+        const author = new Author({
+          name,
+          age
+        });
+        return author.save();
+      }
+    },
+    addBook: {
+      type: BookType,
+      args: {
+        name: { type: GraphQLString },
+        genre: { type: GraphQLString },
+        authorId: { type: GraphQLID }
+      },
+      resolve (parent, { name, genre, authorId }) {
+        const book = new Book({
+          name,
+          genre,
+          authorId
+        });
+        return book.save();
       }
     }
   }
 });
 
 module.exports = new GraphQLSchema({
-  query: RootQuery
+  query: RootQuery,
+  mutation: Mutation
 });