Late at night, close to the silver town of Tombstone, Arizona, a wagon rattles down to the Mexican border laden with heavy crates full of silver ore. Two weeks later, in the town of Rawton, a man's death coincides with John Probity's arrival. By the next day another person has died and Probity is in jail, accused of murder. Freed by the enigmatic town barber, Ulysses Court, Probity sets out to discover the truth. With the number of dead rising, Probity and Court witness the gunning-down of some Mexicans at the San Pedro river and from that moment they are fighting factions from both Tombstone and Rawton. Can they make their way to safety and stay one step ahead of the furious, gun-toting outlaws?