A group of juvenile delinquents live a violent life in the infamous slums of Mexico City; among them Pedro, whose morality is gradually corrupted and destroyed by the others.
Jorge Bueno and Pedro Malo are best friends who consider giving up their womanizing ways when they each fall in love. As fate would have it, Pedro Malo unexpectedly marries Jorge Bueno's girlfriend, and the conflict between the former buddies begins.
Carpenter Pepe El Toro lives peacefully with his daughter Chachita in an impoverished Mexico City neighborhood. He pursues a romance with the pretty Celia, but tragedy comes knocking on his door when he is falsely accused of having perpetrated a felony.
