Anna Macy (played by Elizabeth Debicki) is a highly-regarded doctor, working at a hospital in London. Suffering from frequent headaches and other ill-health, she returns to her home town of Kettering, Tasmania. She left the town under a cloud 15 years earlier after her best friend Gillian disappeared. Back now, she finds that the old animosities remain. Moreover, the strange phenomena that accompanied Gillian's disappearance remain and another girl has disappeared.