Faith, a small-town Welsh lawyer, is forced to cut short her extended maternity leave when her husband and business partner, Evan, goes missing. As the truth of his actions surface, Faith must fight to protect her family and her sanity.
A once-in-a-century storm hits the remote Scottish Island of Toll Mòr. As the isolated community take shelter, a barbaric crime sets off a chain of events which heralds the rise of an ancient evil.