The story, set in 1999, is told in flashback form: in June 1974 a federal justice agent, Benjamín Espósito, becomes spellbound by and subsequently entangled in the investigation of the crime of a young woman, brutally raped and murdered inside her house in a Buenos Aires neighbourhood. Her widowed husband, bank employee Ricardo Morales, is shocked by the news; Espósito vows to find the killer and bring him to justice. In his ordeal he is aided by his alcoholic assistent Pablo Sandoval and a newcomer, the upper class lawyer Irene Menéndez-Hastings, who takes over as department chief. Espósito's rivaling partner Romano pins the murder on two immigrant workers so as to get rid of the matter - an issue that enrages Espósito, who attacks Romano in a fury.