The Fitzgerald sisters Ginger (Katharine Isabelle) and Brigitte (Emily Perkins), fascinated by the macabre, have sworn an oath: "Out by sixteen, or dead in the scene, but together forever". Outsiders at school, their only friends being each other, they live in a querulous world of their own. When they set out to take revenge on a girl who sleighted them, Ginger is attacked by a wild animal: The Beast of Bailey Downs. Later that night, as Ginger's wounds miraculously heal, it is clear she is changing. Ginger wants to believe it is nothing more than the onset of puberty; but her sister Brigitte knows better.