When her husband, an influential lawyer, has just disappeared, Anna Viera confesses to the police that she killed him and finds herself incarcerated. But on the day of her court appearance, a man comes to threaten her: if she does not tell where her husband Manuel really is, her 6-year-old son will pay the price.

In the twists and turns of the Palais de Justice where she has found refuge, Anna is forced to hold Lucas, a young cleaning employee, prisoner. She then decides to explore the place in order to find a way to reveal the truth about Manuel.

Slipping into the shoes of a lawyer, Anna discovers that Manuel participated in a lie aimed at protecting an influential man in a rape and murder case. A manipulation that is now turning against him. To protect him... she sets a trap for him.