A year after one of their identical twin daughters, Lydia, dies in an accident, Angus and Sarah Moorcroft move to the tiny Scottish island Angus inherited from his grandmother, hoping to put together the pieces of their shattered lives. But when their surviving child, Kirstie, claims they have mistaken her identity - that she is, in fact, Lydia - their world comes crashing down once again. As winter encroaches, Angus is forced to travel away from the island for work, Sarah is feeling isolated, and Kirstie (or is it Lydia?) is growing more disturbed. When a violent storm leaves mother and daughter stranded, Sarah finds herself tortured by the past. What really happened on that fateful day, that continues to haunt the living?