Spain, 2013. After the annulment of the “Parot” judicial doctrine, almost one hundred terrorists, rapists and multiple murderers are released without completing their sentences. Society cries out indignantly against the decision... and someone seems to listen. One by one, the released prisoners appear murdered in the same way that their victims were. Faced with the clamor for revenge and the media applause, Isabel Mora, an upright and persevering police officer, but marked by fire by the rape she suffered as a young man at the hands of one of those released, will risk everything to catch the vigilante.