Martin and Antoine, two French criminals, team up with Román and El Picas, a friend of the latter, to commit robberies in Barcelona, but things do not turn out as expected.

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.

A publisher of novels begins to receive packets containing macabre: members of a female corpse. The appearance of a mysterious woman who seems related packages will lead to a situation of dramatic denouement.

Three young seamstresses who share a flat and their love for a night out find an injured girl none of them know in their bathroom.