Three men meet in the same prison and in their cell they find a Mexican boy condemned to death for murder. One night the three convicts are mysteriously released by a priest and the father of the Mexican boy who promises them a reward of $30,000 if they can find the real murderer within ten days. Certain that the Mexican boy is not guilty, Reno and the others organize a plan which leads to the unmasking of the real killers.

Tre pistoleri vengono fatti evadere per trovare il vero colpevole di un assassinio. Riusciranno nell'intento e si guadagneranno un forte premio.

Jerry, Reno y Paco conocen en la cárcel a un joven mexicano, el cual afirma haber sido condenado por un crimen del que es inocente. Los tres hombres son liberados de la cárcel misteriosamente, y se proponen demostrar a inocencia del mexicano.