The life of an orphan boy in a big city, surrounded by poverty, crime and violence. As he grew up, he began a life of crime.

A small child watches as his father is murdered, without knowing even his name the child grows in the poorest part of Mexico City. Nicknamed "perro" (dog), he grew and became juvenile delinquent, which earned him time in a reformatory, without showing change in his behavior he turns to crime as a way of living.—jairhcastillo