Signature Kill (Frank Behr) (Book:4)

An unidentifiable body is found in an Indianapolis park, deliberately arranged so that police know it's not just a random crime. Former cop Frank Behr, now a P.I. with no cases, no money and no options, finds himself chasing down the disappearance of a wayward young woman who's been missing for months in a futile attempt to collect a reward. With assistance from his few remaining contacts on the force, Behr follows the tenuous thread of his case into the world of small-time prostitution-and discovers a possible connection to the body in the park. When another murder victim turns up, it's clear there's a serial killer at work, but this predator seems to be invisible, camouflaged by his perfectly normal-looking life. 

Behr's relentless quest for the missing girl and his parallel pursuit of the killer become entangled with the official police investigation. Ultimately, Behr's obsession with the truth will lead him into the darkest places, and force him to make an unavoidable and devastating decision.