Carlos a young man who lives in the suburbs of the big city has ambitions and wants to change his life. Influenced by friends of doubtful moral character, habituated to frequent harmful environments. Little by little, he begins to see himself doomed to crime and one day he abandons his girlfriend, María, for Isabel, an attractive and intelligent woman who plays with him and takes him wherever he wants. When Carlos, once he has committed a robbery, realizes the nature of Isabel and his friends, and that he will never be happy in that environment, he tries to go back, but the violence of the facts will lead him to a bloodthirsty outcome.

A former convict, named Raul Vela, and a cabaret singer, called Clara, are a couple who tries to lead a normal life. He has found an employment and she wants to leave the cabaret. One day an old chief, who wants to disappear, proposes him to justify his supposed death in a supposed accident. In exchange, Raúl will receive one hundred thousand pesetas as gratification. Raul refuses to engage in the deception. Shortly after, he reads in a newspaper about the death of Cervera, which makes the police relate him to the case.

Paco, a Sevillian living in Paris who works as a music hall singer, receives news of the death of his uncle named him heir to his fortune. The only condition imposed is to pass a test that is to fight in one of the main squares in Spain. If the attempt fails, the estate would pass to her sister full. From here, Paco will have to wake up if he want to show their courage and take part in a bullfight.