Four angry cadets have formed an inner circle in an attempt to beat the system and ward off the boredom and stifling confinement of the military academy, set off a chain of events that starts with a theft and leads to murder.

In an abandoned glass factory, a woman exploits her workers, all of them mentally ill. A gang of young assailants decides to rob said factory, but in order to achieve that, they must get one of them into the woman's house first. What they do know is that Maruja, the woman's goddaughter also lives there.