Detective Reuben "Diego" Montoya must team up with the prime suspect in a murder case to catch a serial killer who is keeping New Orleans in the grip of fear, an investigation that leads them to an abandoned asylum where unspeakable evil awaits them.

There are killers so savage, so twisted, that they leave a mark not just on their victims, but on everyone who crosses their path. For Detectives Bentz and Montoya, Father John, a fake priest who used the sharpened beads of a rosary to strangle prostitutes, is one such monster. Bentz thought he’d ended that horror years ago when he killed Father John deep in the swamp. But now there are chilling signs he may have been wrong. A new victim has surfaced,...