The Woods by Harlan Coben

Twenty years ago at summer camp, Paul Copeland's sister died in the woods, the alleged victim of a serial killer. Her body was never found. Now, Paul is the prosecutor for Essex County, New Jersey, immersed in one of the biggest cases of his career--a case that will change everything he believes about the past. . . and the truth.

I suppose it's enough to tell you that I read this 400 page book in a day (a Saturday admittedly). I started it in the morning when I was woken early by a nearby house alarm and couldn't put it down. Eventually I did tear myself away from it but spent the late afternoon and evening finishing it. I enjoyed it :)