One by one he'll stalk them, then he'll squeeze the trigger, savouring the way each lifeless body crumples to the reddening snow. One down already. And then there were five...

Sheriff Dan Grayson lies near death and the police department of Grizzly Falls, Montana, is in shock. Then a prominent judge's body is found.

Detectives Regan Pescoli and Selena Alvarez head up the search for the killer, but they don't realize how personal and dangerous the case is going to be. Headstrong and eager for justice, Pescoli tracks the scant clues straight to a monster who has had her and Alvarez in his sights all along...