Another great book by Coben!

Dr. Beck lost his wife Elizabeth 8 years ago when she was abducted and killed while they were at a lake they frequently escaped to.

Now 8 years later, it's coming up on the anniversary. Beck starts getting cryptic messages in code... Messages containing things only Elizabeth would know. 

As is Coben's style, this is a very fast paced story. It grabs you from the beginning and keeps you in it's grip as secrets come to light.
There is so much info but it comes out smoothly and makes you go "this all makes sense!"