This book had such potential. I loved the premise of time traveling to past versions of yourself to somehow right a wrong. But execution is key to a story like that and this one fell just a little short. I'm not sure if it's was the presentation of current versus past life in this ARC copy or the writing style, but it was sometimes confusing when we would jump to a past life. Add to that little explanation about drifting and why the FBI has a whole department on the subject and it left me sometimes wondering what was going on.