In the citadel of Besançon, Annah is worried when her daughter doesn't return from the zoo. She calls and is told by a man that he has kidnapped her. Forced to obey this sadistic predator, she will have to perform increasingly violent acts if she wants to see her daughter again. violent acts if she is to see her daughter alive again. Will Annah succeed in extricating herself from this nightmare and save her daughter?