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 and threatens to change the course of history. Starring Golden Globe winner Joanne Froggatt as Police Sergeant Jackie O'Hara, this 8-part supernatural crime thriller is created by celebrated writer and director Mark Healy and produced by Storyglass.