Evie Mathews and her son Alfie flee from her abusive partner Seth to spend New Year with her half-brother Luke at their late father's summer home on the Suffolk Coast, only to find Seahurst abandoned and Luke missing. Evie searches for her brother, filled with a deepening dread that something is very wrong at Seahurst and their father's death may not have been suicide after all. As Seahurst's ancient and sinister secrets unfurl around her, Evie fears the souls of the dead will soon claim another terrible revenge.