1971. Beatriz is a 17-year-old Brazilian student. She is arrested by the military dictatorship on charges of belonging to the subversive student movement and an armed guerrilla group fighting against the regime, the Vanguarda Armada Revolucionária Palmares / VAR-Palmares. After enduring ten days of torture without the military proving her involvement, Beatriz is returned to her family, battered and bruised, by a Brazilian Army officer who simply says, "Sorry, it was a mistake."