Three teenage Parisian punks are duped by a crime syndicate into committing a bank robbery that will distract the authorities while the seasoned crooks hijack an armored truck across town. Disaster ensues and two of the youngsters are killed, including the estranged daughter of widowed auto repair shop owner Jeanne Dufour. A grieving Jeanne ignores her own fear, as well as the law, and sets out to eliminate all of those responsible for her daughter’s death.