Someone is watching. At each abandoned crime scene there's a hidden clue : a tiny metal cog, almost invisible to the naked eye. Someone is sending Detective Sam Berger a message, and that someone knows that only he will understand the cryptic trail. Someone knows. When another teenaged girl disappears without trace, Sam must convince his superiors that they're dealing with a serial kidnapper and possible killer. As the police continue the hunt to find the latest kidnap victim, Sam is forced to unearth long buried personal demons - he has no choice if he is to understand the brute's darkly personal message before time runs out. Somebody is killing just for him.