A scientist attempts to perform memory transfusions with disastrous results.
Tony wants to carry out a perfect robbery and get a lot of money during the celebration of the 24 Hours of Montjuic, a motorcycle race. To accomplish this, he counts with the complicity of Peter, a runner who wants to switch to professional level. Everything is carefully planned, but at the last moment a crime is committed and Peter is trapped in the house of the victim unable to get out as the gate has been locked. The only way to help Peter is that Tony gets a copy of the key that Carmen has, the girl who took care of the victim, before she returns home.
A young factory worker sends out pictures of herself to a beauty contest and hopes to be chosen. In the same place works Fernando, whom the other employees do not like because of his being very arrogant. In revenge, Rosita pretends to love him. Fernando discovers her double game, but also pretends he is not aware.
After being fired from his company, Pablo meets his friend Ana, who introduce him to Pedro Ramírez, an undesirable lawyer, who offers him 15,000 pesetas for reports about his ex-company with the intention of doing a rob. When the lawyer's gang goes to give the coup, Ana reports them to the police, with the idea of taking the loot and fleeing with Pablo. But all of them are arrested and end up together in prison, where the intrigues and skirmishes between them will continue.