The Dead Letters — Tom Piccirilli

Five years ago, Eddie Whitt's daughter Sarah became the victim of a serial killer known as Killjoy, and Whitt vowed to hunt him down--no matter what the cost. But the police have given up. And Killjoy has stopped killing...and in some bizarre act of repentance has begun kidnapping abused infants and leaving them with the parents of his original victims.

The only clues to Killjoy's identity lie in a trail of taunting letters. And even as they lead Whitt to a deadly cult--and closer to his prey--he begins to suspect that, like his wife, he's losing his grip on reality: Sarah's dollhouse is filled with eerie activity, as if her murder never occurred. As dark forces rise around him, Whitt must choose--between believing that evil can repent...and stepping into a trap set by a killer who may know the only way to save Whitt's soul.