In a near future, society has become divided into two clearly differentiated and demarcated blocks within each one of the cities and towns all over the world: the rich neighbourhood and the poor neighbourhood. Carmen is a teenager who lives with her father in an old house of the poor area. The Father, due to an accident, can no longer walk, which he tries to conceal from the rest of the people, as he thinks that, if it became known, everybody would regard his daughter as unprotected. It is therefore Carmen who leaves home every day to find work and/or something to eat.

Rosario Tijeras has been abused by men all her life, initially by her stepfather. Years later, she works as a paid assassin, seducing men and killing them when they least expect it. She meets Emilio, a wealthy womanizer, and his best friend, Antonio, at a nightclub, and starts an affair with Emilio despite Antonio's growing feelings for her. But circumstances bring her closer to Antonio, until her past catches up with her in a devastating way.