In Grizzly Falls, Montana, Detectives Selena Alvarez and Regan Pescoli are struggling with a new commander and a department in the midst of upheaval. It's the worst possible time for a homicide. A body has been found, missing a finger. Alvarez hopes this means a murderer with a personal grudge, not a madman. But then a second body turns up ... As the clues begin pointing toward a suspect, Pescoli's unease grows. She senses there's more to this case than others believe. A killer has made his way to Grizzly Falls, ready to fulfil a vengeance years in the making. And Pescoli must find the target of his wrath - or die trying.