First of all, this book you will NOT be able to put it down until you finish! It's such a compulsion to find out what in the world is going on that it just keeps you riveted. 

Liv had a specific amnesia that stems from a trauma she experienced.... That she can't remember. Anytime she falls asleep, she wakes up thinking she's back in her life 2 years ago. She becomes very confused and scares a lot of people because her life has been dramatically different.

I was obsessed with Liv. I loved how we slowly got glimpses into what happened 2 years ago. While I figured out a few things, I didn't figure out the main *spoiler here* until closer to the end. 

This was a bit like the movie 50 First Dates not with murder. That's what I kept thinking during the whole thing. What a terrible thing to go through not remembering anything once you wake from sleep.