Julie (Jeanne Moreau) is the young widow who seeks revenge for the death of her husband. She targets her victims for demise and sets out to knock them off one by one. The first victim is pushed from a balcony, the second is poisoned in his own home. She poses as Diane the Huntress and shoots the artist with her bow and arrow. A pretentious man is locked in a closet and sealed off to die. Julie willfully confesses her murders to a priest who is helpless to break the silence by his religious vows of the sanctity of confession. When the last man is found to be locked in jail, Julie conspires to get herself arrested to gain access to the unfortunate prisoner.