In the lonely woods of Grizzly Falls, Montana, four bodies are found. Detectives Selena Alvarez and Regan Pescoli are working with the FBI on this nightmare of a case, where all the only clues they have are cryptic notes left behind by the killer.

When Jillian Rivers opens her eyes, she is trapped inside a mangled car. A stranger who claims to be a trail guide, pries her free, but something about him makes her nervous. If she knew what lay ahead, she'd be a lot more than nervous.