diff --git a/api/model/book.js b/api/model/book.js
new file mode 100644
index 0000000..657e4d4
--- /dev/null
+++ b/api/model/book.js
@@ -0,0 +1,15 @@
+var mongoose = require("mongoose");
+var Schema = mongoose.Schema;
+
+var schema = new Schema({
+  title: { type: String },
+  published: { type: Number },
+  authors: [
+    {
+      name: String,
+      dob: String
+    }
+  ]
+});
+
+module.exports = mongoose.model("Books", schema);
diff --git a/api/routes/books.authors.js b/api/routes/books.authors.js
new file mode 100644
index 0000000..f4da61d
--- /dev/null
+++ b/api/routes/books.authors.js
@@ -0,0 +1,53 @@
+// Include :seriesId
+const router = require("express").Router({ mergeParams: true });
+const Books = require("../model/book");
+
+router.get("/", async (req, res, next) => {
+  const status = 200;
+
+  const { authors } = await Books.findById(req.params.bookId).select("authors");
+  res.json({ status, authors });
+});
+
+router.get("/:id", async (req, res, next) => {
+  const status = 200;
+
+  const books = await Books.findById(req.params.bookId);
+
+  const author = books.authors.id(req.params.id);
+
+  res.status(status).json({ status, author });
+});
+
+router.post("/", async (req, res, next) => {
+  const status = 201;
+  const books = await Books.findById(req.params.bookId);
+
+  books.authors.push(req.body);
+  await books.save();
+
+  const author = books.authors[books.authors.length - 1];
+  res.status(status).json({ status, author });
+});
+
+router.put("/:id", async (req, res, next) => {
+  const status = 200;
+  const books = await Books.findById(req.params.bookId);
+
+  const author = books.authors.id(req.params.id);
+  Object.assign(author, req.body);
+  await books.save();
+
+  res.status(status).json({ status, author });
+});
+
+router.delete("/:id", async (req, res, next) => {
+  const status = 200;
+  const books = await Books.findById(req.params.bookId);
+  const author = books.authors.id(req.params.id).remove();
+  await books.save();
+
+  res.status(status).json({ status, author });
+});
+
+module.exports = router;
diff --git a/api/routes/books.js b/api/routes/books.js
index 10a56a9..742638b 100644
--- a/api/routes/books.js
+++ b/api/routes/books.js
@@ -1,73 +1,80 @@
-const router = require('express').Router()
-const { generate: generateId } = require('shortid')
+const router = require("express").Router();
+const { generate: generateId } = require("shortid");
+const Books = require("../model/book");
 
 const books = [
   {
-    id: 'j9U3iNIQi',
-    title: 'The Colour of Magic',
+    id: "j9U3iNIQi",
+    title: "The Colour of Magic",
     published: 1983,
     authors: [
       {
-        name: 'Sir Terry Pratchett',
-        dob: '04-28-1948'
+        name: "Sir Terry Pratchett",
+        dob: "04-28-1948"
       }
     ]
   },
   {
-    id: 'ubQnXOfJV',
-    title: 'Stardust',
+    id: "ubQnXOfJV",
+    title: "Stardust",
     published: 1997,
     authors: [
       {
-        name: 'Neil Gaiman',
-        dob: '11-10-1960'
+        name: "Neil Gaiman",
+        dob: "11-10-1960"
       }
     ]
   }
 ];
 
-router.get('/', (req, res, next) => {
-  const status = 200
-  const response = books
-  
-  res.json({ status, response })
-})
+router.get("/", async (req, res, next) => {
+  const status = 200;
 
-router.post('/', (req, res, next) => {
-  const status = 201
-  
-  books.push({ id: generateId(), ...req.body })
-  const response = books
-  
-  res.json({ status, response })
-})
+  Books.find().then(response => {
+    res.json({ status, response });
+  });
+});
+/************************************************* */
+router.post("/", async (req, res, next) => {
+  const status = 201;
 
-router.get('/:id', (req, res, next) => {
-  const status = 200
-  const response = books.find(({ id }) => id === req.params.id)
+  try {
+    Books.create(req.body).then(response => {
+      res.json({ status, response });
+    });
+  } catch (error) {
+    console.error(error);
+    const e = new Error("Sonthing went wrong");
 
-  res.json({ status, response })
-})
-
-router.put('/:id', (req, res, next) => {
-  const status = 200
-  const response = { id: req.params.id, ...req.body }
-  const single = books.find(({ id }) => id === req.params.id)
-  const index = books.indexOf(single)
-
-  books.splice(index, 1, response)
-  
-  res.json({ status, response })
-})
+    e.status = 400;
+    next(e);
+  }
+});
+/************************************************* */
+router.get("/:id", async (req, res, next) => {
+  const status = 200;
 
-router.delete('/:id', (req, res, next) => {
-  const status = 200
-  const response = books.find(({ id }) => id === req.params.id)
-  const index = books.indexOf(response)
+  Books.findById(req.params.id).then(response => {
+    res.json({ status, response });
+  });
+});
+/************************************************* */
+router.put("/:id", async (req, res, next) => {
+  const status = 200;
+  const response = await Books.findOneAndUpdate(
+    { _id: req.params.id },
+    { title: req.body.title, published: req.body.published },
+    { new: true }
+  );
 
-  books.splice(index, 1)
+  res.json({ status, response });
+});
+/************************************************* */
+router.delete("/:id", async (req, res, next) => {
+  const status = 200;
+  const response = await Books.findOneAndDelete({ _id: req.params.id });
 
-  res.json({ status, response })
-})
+  res.json({ status, response });
+});
 
-module.exports = router
\ No newline at end of file
+module.exports = router;
diff --git a/app.js b/app.js
index 075ce75..c74a97d 100644
--- a/app.js
+++ b/app.js
@@ -1,37 +1,41 @@
-const { MONGO_DB_CONNECTION, NODE_ENV, PORT } = process.env
-const express = require('express')
-const mongoose = require('mongoose')
-const app = express()
+const { MONGO_DB_CONNECTION, NODE_ENV, PORT } = process.env;
+const express = require("express");
+const mongoose = require("mongoose");
+const app = express();
 
 // Database Connection
 if (MONGO_DB_CONNECTION) {
-  mongoose.connect(MONGO_DB_CONNECTION, { useNewUrlParser: true })
-  console.log('Connected to database...')
+  mongoose.connect(MONGO_DB_CONNECTION, {
+    useNewUrlParser: true,
+    useFindAndModify: false
+  });
+  console.log("Connected to database...");
 } else {
-  console.log('Could not connect to database!')
+  console.log("Could not connect to database!");
 }
 
 // Application-level Middleware
-if (NODE_ENV === 'development') app.use(require('morgan')('dev'))
-app.use(require('body-parser').json())
+if (NODE_ENV === "development") app.use(require("morgan")("dev"));
+app.use(require("body-parser").json());
 
 // Routes
-app.use('/api/books', require('./api/routes/books'))
+app.use("/api/books", require("./api/routes/books"));
+app.use("/api/books/:bookId/authors", require("./api/routes/books.authors"));
 
 // Not Found Handler
 app.use((req, res, next) => {
-  const error = new Error(`Could not ${req.method} ${req.path}`)
-  error.status = 404
-  next(error)
-})
+  const error = new Error(`Could not ${req.method} ${req.path}`);
+  error.status = 404;
+  next(error);
+});
 
 // Error Handler
 app.use((err, req, res, next) => {
-  if (NODE_ENV === 'development') console.error(err)
-  const { message, status } = err
-  res.status(status).json({ status, message })
-})
+  if (NODE_ENV === "development") console.error(err);
+  const { message, status } = err;
+  res.status(status).json({ status, message });
+});
 
 // Open Connection
-const listener = () => console.log(`Listening on Port ${PORT}!`)
-app.listen(PORT, listener)
+const listener = () => console.log(`Listening on Port ${PORT}!`);
+app.listen(PORT, listener);
diff --git a/package-lock.json b/package-lock.json
index 5dcf387..38c21d4 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -855,8 +855,7 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -877,14 +876,12 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -899,20 +896,17 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -1029,8 +1023,7 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "ini": {
           "version": "1.3.5",
@@ -1042,7 +1035,6 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -1057,7 +1049,6 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -1065,14 +1056,12 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -1091,7 +1080,6 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -1172,8 +1160,7 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -1185,7 +1172,6 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -1271,8 +1257,7 @@
         "safe-buffer": {
           "version": "5.1.2",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -1308,7 +1293,6 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -1328,7 +1312,6 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -1372,14 +1355,12 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "yallist": {
           "version": "3.0.3",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         }
       }
     },
@@ -1775,9 +1756,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.11",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.11.tgz",
-      "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg=="
+      "version": "4.17.14",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.14.tgz",
+      "integrity": "sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw=="
     },
     "lowercase-keys": {
       "version": "1.0.1",
@@ -1895,9 +1876,9 @@
       "dev": true
     },
     "mixin-deep": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/mixin-deep/-/mixin-deep-1.3.1.tgz",
-      "integrity": "sha512-8ZItLHeEgaqEvd5lYBXfm4EZSFCX29Jb9K+lAHhDKzReKBQKj3R+7NOF6tjqYi9t4oI8VUfaWITJQm86wnXGNQ==",
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/mixin-deep/-/mixin-deep-1.3.2.tgz",
+      "integrity": "sha512-WRoDn//mXBiJ1H40rqa3vH0toePwSsGb45iInWlTySa+Uu4k3tYUSxa2v1KqAiLtvlrSzaExqS1gtk96A9zvEA==",
       "dev": true,
       "requires": {
         "for-in": "^1.0.2",
@@ -2491,9 +2472,9 @@
       }
     },
     "set-value": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/set-value/-/set-value-2.0.0.tgz",
-      "integrity": "sha512-hw0yxk9GT/Hr5yJEYnHNKYXkIA8mVJgd9ditYZCe16ZczcaELYYcfvaXesNACk2O8O0nTiPQcQhGUQj8JLzeeg==",
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/set-value/-/set-value-2.0.1.tgz",
+      "integrity": "sha512-JxHc1weCN68wRY0fhCoXpyK55m/XPHafOmK4UWD7m2CI14GMcFypt4w/0+NV5f/ZMby2F6S2wwA7fgynh9gWSw==",
       "dev": true,
       "requires": {
         "extend-shallow": "^2.0.1",
@@ -2872,38 +2853,15 @@
       }
     },
     "union-value": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
-      "integrity": "sha1-XHHDTLW61dzr4+oM0IIHulqhrqQ=",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
+      "integrity": "sha512-tJfXmxMeWYnczCVs7XAEvIV7ieppALdyepWMkHkwciRpZraG/xwT+s2JN8+pr1+8jCRf80FFzvr+MpQeeoF4Xg==",
       "dev": true,
       "requires": {
         "arr-union": "^3.1.0",
         "get-value": "^2.0.6",
         "is-extendable": "^0.1.1",
-        "set-value": "^0.4.3"
-      },
-      "dependencies": {
-        "extend-shallow": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
-          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
-          "dev": true,
-          "requires": {
-            "is-extendable": "^0.1.0"
-          }
-        },
-        "set-value": {
-          "version": "0.4.3",
-          "resolved": "https://registry.npmjs.org/set-value/-/set-value-0.4.3.tgz",
-          "integrity": "sha1-fbCPnT0i3H945Trzw79GZuzfzPE=",
-          "dev": true,
-          "requires": {
-            "extend-shallow": "^2.0.1",
-            "is-extendable": "^0.1.1",
-            "is-plain-object": "^2.0.1",
-            "to-object-path": "^0.3.0"
-          }
-        }
+        "set-value": "^2.0.1"
       }
     },
     "unique-string": {
diff --git a/readme.md b/readme.md
index 4a3bdf4..7b903f4 100644
--- a/readme.md
+++ b/readme.md
@@ -13,10 +13,11 @@ This exercise will assess your ability to build a fully working API with MongoDB
 As it stands, this repository contains an API for books. Update each route so that it uses a MongoDB database instead of recording the information in-memory.
 
 Additionally, add a new set of routes for the authors. For example:
+
 ```
-GET /api/books/:bookId/authors
-GET /api/books/:bookId/authors/:authorId
-POST /api/books/:bookId/authors
-PUT /api/books/:bookId/authors/:authorId
+GET    /api/books/:bookId/authors
+GET    /api/books/:bookId/authors/:authorId
+POST   /api/books/:bookId/authors
+PUT    /api/books/:bookId/authors/:authorId
 DELETE /api/books/:bookId/authors/:authorId
 ```