diff --git a/server/schema/schema.js b/server/schema/schema.js
index 3a90c94..d125a0c 100644
--- a/server/schema/schema.js
+++ b/server/schema/schema.js
@@ -4,6 +4,8 @@ const _ = require('lodash');
 const {
   GraphQLObjectType,
   GraphQLString,
+  GraphQLID,
+  GraphQLInt,
   GraphQLSchema
 } = graphql;
 
@@ -13,25 +15,46 @@ const books = [
   { name: 'The Final Empire', genre: 'Fantasy', id: '2' },
   { name: 'The Long Earth', genre: 'Sci-Fi', id: '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 BookType = new GraphQLObjectType({
   name: 'Book',
   fields: () => ({
-    id: { type: GraphQLString },
+    id: { type: GraphQLID },
     name: { type: GraphQLString },
     genre: { type: GraphQLString }
   })
 });
 
+const AuthorType = new GraphQLObjectType({
+  name: 'Author',
+  fields: () => ({
+    id: { type: GraphQLID },
+    name: { type: GraphQLString },
+    age: { type: GraphQLInt }
+  })
+});
+
 const RootQuery = new GraphQLObjectType({
   name: 'RootQueryType',
   fields: {
     book: {
       type: BookType,
-      args: { id: { type: GraphQLString } },
+      args: { id: { type: GraphQLID } },
       resolve (parent, { id }) {
         return _.find(books, { id });
       }
+    },
+    author: {
+      type: AuthorType,
+      args: { id: { type: GraphQLID } },
+      resolve (parent, { id }) {
+        return _.find(authors, { id });
+      }
     }
   }
 });