Billie lives alone with her grandfather, a humble and considerate old man who never talks about his past. All Billie knows is that her mother named her after the famous singer Billie Pretty, whose fan she was. Clinging to this family legend, Billie grows up, skateboards, watches the world with a gimlet eye, and tries to overcome her shyness by dragging her best friend Maxime away from his middle-class family who hate her. One day, Billie finds out Billie Pretty isn't real. Her world crumbles. It's all held her back: her modest upbringing with its secrets and silence, her loneliness... She leaves for Paris, determined to live for herself, not admitting she'd love to see Maxime again...