A mother must fight for her daughter’s life in this fierce and haunting tale of witchcraft and revenge.

Clem receives a call every mother dreads. Her nineteen-year-old daughter, Erin, is unconscious in the hospital after a hiking trip on the remote Orkney Islands ends in horror, leaving her boyfriend dead and her best friend missing. When Erin awakens, she doesn't recognize her mother, instead claiming to be someone named Nyx.

Determined to uncover the truth, Clem travels to the site of the accident. She explores a dark secret from the Orkneys' past: a woman wrongly accused of witchcraft and murder four centuries ago. Clem questions whether Erin’s odd behavior is a sign of mental distress or the result of an ancient curse.