A group of juvenile delinquents live a violent and crime-filled life in the festering slums of Mexico City, as the morals of young Pedro are gradually corrupted and destroyed by the others.
A poor cobbler has become a drunkard and the laughing stock of the whole neighborhood, besetting his daughter. When she falls in love with a rich young man, her father tries in vain to hide his passion from his family.
Tired of putting up with his nephew's reluctance to settle down, a grocer picks out an exciting personal ad and takes him to meet his wife-to-be. But, both are secretly in steady relationships. What will happen when the truth comes out?