Darkness falls on the beautiful hiking trails of Castle Rock, and death strikes without warning. After the first body was found with its throat ripped out, Detective Ryan Wade and Dr. Kayla Niccoles seek answers. The coroner reveals the body was riddled with rabies, probably an attack by a rogue bear or wolf, but when more people are killed, an enigmatic visiting zoologist presents a disturbing theory - one that goes beyond the boundaries of natural...