Véra Cabral, an emergency psychiatrist, is called in to help Giselle Leguerche, who has been incarcerated for murder. The inmate, who is about to be released and has no previous history of prison life, commits the irreparable act of murdering a female prison guard and taking an infant hostage. After resolving the situation, Véra Cabral is entrusted with the prisoner's psychiatric expertise. An investigation into Giselle Leguerche's past then begins, leading the psychiatrist down unexpected paths linked to the prisoner's past.