The Host by Stephenie Meyer. This book is completely different from the Twilight series. This book is somewhat like Ender's Game and Uglies, combined. Both of which, are very very good books as well. When reading it, you are inside the mind of two different characters at once, following their thoughts and emotions, and the moral struggle within. The book is pretty genius. Also, it's just a great love story, but still filled with action and suspense. Read it!