This app is my secret weapon for supercharging my e-reader

It’s easy to own an e-reader and only buy books from its on-device store. In fact, companies like Amazon, who both sell the Kindle and operate the Kindle Store where you can purchase books for it, prefer things that way. You’ll find similar experiences in plenty of e-readers — it’s not unusual — but it doesn’t reflect what owning a book is like in real life.