This was an absolutely breakneck edge-of-the-seat thriller. This book explores the concept of different worlds in which you made different decisions and it is very thought-provoking. Jason has some great development and his journey throughout this book will have you cheering for him. I do have to say however, that the book didn't land as well emotionally as it was supposed to for me, however it might be different for others. All-in-all, this is a great blend of sci-fi, thriller and love story and I would recommend you to read it.