In Mexican legend, Cañada Diablo is the haunt of the supernatural beast nagualismo. For cattle rustler Eddie Cardigan, it is a hideout – until one of his men is killed in the brush. Cardigan first suspects local criminals, who have mistaken him for a gun runner. Then he thinks it may be the mysterious man named Africano and his two vicious dogs. When Sheriff Masset, hot on the trail of Cardigan, is killed by a creature with huge paw prints, Cardigan must get to the truth of the killings, without revealing the truth about himself.