When old friend Marty O'Bannon, a San Francisco Homicide Detective, calls FBI Agent Zack Tolliver early one morning with news of a third murder victim, her throat ravaged as if by an animal, Zack agrees to assist him with the investigation. But Zack's responsibilities at the Navajo Indian Reservation prevent him from leaving and so he send his friend Eagle Feather, a local hunting guide, in his stead. But what Eagle Feather discovers inevitably draws Zack to the city and into the vortex of a deadly mystery.