Finding bodies is part of the job for Detective Otto Haines, but when a victim's limbs are found in two public parks miles apart from each other, he is utterly confused. Most speculate that it must be some sadistic killer, bent on mutilating his victims and leaving his "calling cards" behind in the ghostly hours of the night.

And there are problems along the way. As Detective Haines tries to hunt down this killer, he must also deal with his rookie partner, Serena Grimm, while trying to keep a secret from his past out of the spotlight. As the trail to the killer becomes a labyrinthine search with shifting suspects and no end in sight, the impossibly horrific nature of these crimes forces Otto to reconsider everything he has known about good and evil.