To sing and dance on their birthday, a girl has kidnapped the manager of the youth group Tremendo. Tremendo was a prefabricated pop band, created in Argentina to compete with Menudo, that Puerto Rican group that had Riky Martin in its ranks.

A serial killer of prostitutes is threatening the authorities. Sara steps in, unemployed and without a place to live, staying for a while with her friend Pata. Sara gets a job in a courthouse particularly concerned about the killer. When Pata's client reads Sara's fortune, fate has a crucial confrontation with the law in store for her.