Since Amy's daughter, Ruby-May, died in a terrible accident, her family have been beset by grief. One year later, the family decide to go on holiday to mend their wounds. An idyllic island in Italy seems the perfect place for them to heal and repair their relationships with one another. But no sooner have they arrived than they discover nothing on this remote island is quite as it seems. And with the anniversary of the little girl's death looming, it becomes clear that at least one person in the family is hiding a shocking secret. As things start to go rapidly wrong, Amy begins to question whether everyone will make it home.