Google Play Books is a chrome app by books.google.com. This app allows you to select from over 4 million books vailable on Google Play Store and you can take away your favorite ones with you and read them offline on your Chromebook.
https://www.youtube.com/watch?v=TaZSMlq10oU
Using this cool Google Chrome app you can use about any device you have for reading any book, anywhere. Provides you great reading experience, you can read your even when you are not connected to Internet and there are many more features like you can edit font, layout, you can search within book you are reading, you can highlight text, add margin notes, select words to find definition, to translate, or for searching online.
It provides you with more than 4 million books in every imaginable category, from the New York Times bestsellers to favorite classics and gives unlimited storage of books in digital cloud and more.