Given a chance to salvage his law enforcement career, Dona Ana County Sheriff’s Detective Clayton Istee catches a bizarre late-night double homicide at a Las Cruces hotel. Both victims have been scalped with their throats cut. The murders show all the signs of a signature hit, but national and state crime databases reveal no similar profiles. Digging into the victims’ backgrounds, Clayton discovers that six months prior the couple had walked out of a nearby casino with $200,000 of a high-stakes gambler’s money. He also learns the crime had been hushed up by an undercover federal DEA agent, who resurfaces and recruits Clayton for a dangerous mission to seize the Mexican drug lord responsible for the killings.

In the wake of the death of his wife as she gives birth to his son, and the killing of his brother, John Kerney is forced to give up his ranch, leave his son behind, and strike out in search of the murderous outlaws and a place where he can start over. He drifts south until he meets a man who offers him work trailing cattle to the New Mexico Territory and forever changes his life.