What do you think? The strange message, inked on a homicide victim, makes Detective Ellie MacIntosh's blood run cold. What do you think now? Worse, it is soon followed by a message on a second victim in the same location. MacIntosh realizes this is personal--a challenge directed at her and her volatile partner, Jason Santiago. As a cat and mouse game with a conscienceless killer emerges, the detectives start to fear that they have met their match. His deranged obsession is costing lives, and soon he contacts MacIntosh personally to taunt her. Ellie must race against time to try to solve the unsolvable before it is too late.