Care worker Shoo, who is haunted by a personal tragedy, is sent to a remote village to care for an agoraphobic woman, who fears both her neighbours and the Na Sídhe – sinister folkloric entities she believes abducted her decades before.

In the autumn of 1960, Father Thomas Riley and Father John Thornton were sent by the Vatican to investigate a miraculous event in an Irish home for 'fallen women', only to uncover something much more horrific.