Jack Caffery's newest case seems like a routine carjacking, a crime he's seen plenty of times before. But as the hours tick by and his investigation morphs into a nightmare, he realizes the sickening truth: the thief wasn't after the car, but the eleven-year-old girl in the backseat. Meanwhile, police diver Sergeant Flea Marley is pursuing her own theory of the case, and what she finds in an abandoned, half-submerged tunnel could put her in grave danger.

The carjacker is always a step ahead of the Major Crime Investigation Unit, toying with their minds in taunting letters, and ready to strike again. As the chances for his victims grow slimmer, Jack and Flea race to fit the pieces together in time.