Bulmaro Reyes, a former police commander tracks down "El Coyote", a bloody killer and fugitive from the law, with the help of his police friend. He will do the unthinkable to capture the brutal killer of his family

El coyote: Mente diabolica

An old man marries a twenty-year-old woman, but the woman does it only to get the man's son whom she persistently pursues. Annoyed with his step-mother's harassment, the young man decides to change towns and leaves. On the road he meets a quack and swindler who goes everywhere deceiving people. The two become friends and together they arrive at the next town.