Suzanne, a 15-year-old Paris girl, lives with her volatile, abusive family: her furrier parents and older brother Robert, a writer. She's dating a boy named Luc, who complains about not seeing her as much as he would like. At a cafe, Suzanne mingles with sailors and an American visitor. She and the American head outdoors and have sex, though the experience leaves her miserable. She tells a friend she regrets her unfaithfulness to Luc, but she breaks up with him and becomes increasingly sexual promiscuity. Her father is close to Suzanne but reacts with suspicion and violence when Suzanne goes on a double date with her cousin Solange. When Suzanne returns, her father expresses concern with her changing demeanor, saying she smiles less and seems increasingly bored. He also discloses he has found another woman and is planning to leave the family.