When sisters Lily and Della Pedley are persecuted for the shocking murder of their parents, they flee from their home in Cornwall to a remote and unnamed island in Scotland - an island known for its strange happenings, but far away from the whispers and prying eyes of strangers. Lily is terrified of what her sister might do next, and she soon realises that they have arrived at a place where nothing is as it seems. The stories told by the islanders seem to be far more than folklore. Della settles in too easily, the island folk drawn to her strangeness, but Lily is plagued by odd and unsettling dreams, and as an annual festival draws nigh, she discovers that she has far more to fear than she could ever have imagined. Or does she. . .?