Before I Go To Sleep by S.J. Watson

The premise of this book is a fascinating concept and I was kept guessing throughout. I found myself getting a little frustrated when parts of the novel seemed to unravel and lose momentum. When circumstances started to get redundant my attention drifted but Watson manages to snap you back for a dynamite ending. 


You will find an official plot line description at: 
http://www.goodreads.com/book/show/9736930-before-i-go-to-sleep