The story of a group of women prisoners. Isa is a robber, caustic yet generous, unable to adjust to life outside prison. Dolores is a blond gypsy who killed her husband. Rosa is a fragile and tender prostitute. Ajo, who is in love with Pilar, lives her life to the limit of endurance. Luisa is a naive Colombian surprised for an environment that does not understand. The arrival of Mar, a corrections officer who ignores the rules of the institution, brings the women on a flight to freedom. With the help of Adela, the director of the prison, they create Module 4, a theatre group that gives them strength to face the hard knocks with which he came into the world.