This "Amnesia Thriller" Will Be Hard For the Reader to Forget

Christine wakes up in an unfamiliar house, thinking she's twenty something years old, and having no recognition of the man asleep in the bed beside her.  Trying to figure out what's going on, she discovers the woman staring back at her from the bathroom mirror is someone in her forties and the unrecognizable man turns out to be her husband, Ben.  Thus begins the debut novel Before I Go To Sleep,