Nina Landry has given up city life for the isolated community of Sandling Island, lying off the bleak east coast of England. At night the wind howls. Sometimes they are cut off by the incoming tide. For Nina though it is home. It is safe. But when Nina's teenage daughter Charlie fails to return from a sleepover on the day they're due to go on holiday, the island becomes a different place altogether. A place of secrets and suspicions . . .