On the rugged Colorado mountain ridge, Mattie Cobb and her law enforcement pet partner Robo produce a grisly discovery-and become the targets of a ruthless killer.

Colorado’s Redstone Ridge is a place of extraordinary beauty, but this rugged hill wilderness harbors a horrifying secret. Whenever a charred person is uncovered in a shallow grave on the ridge, official Mattie Cobb and her K-9 partner Robo are called directly into spearhead the investigation. But this is no normal crime-and it shortly becomes clear that Mattie has a close personal connection to the dead man.

Joined up with by local veterinarian Cole Walker, the set scours the mountaintop for evidence and makes another gruesome discovery: the skeletonized remains of two adults and a child. And then, the unthinkable happens. Could Mattie end up being the next sufferer in the murderer’s deadly game?

A deranged killer torments Mattie having a litany of dark secrets that contact into issue her very identification. As a towering blaze races across the ridge, Cole and Robo search frantically for her-but time is operating out.