In Ireland, Gannington Manor has remained empty for years, and rumor has it the mansion is haunted. What appears to be blood drips from the ceiling, and two men have been found dead within—both in the great entrance hall, neither displaying any signs of violence. Perhaps it is a prank, or perhaps it is something more sinister.

Psychic detective Thomas Carnacki, the ghost finder, recruits a group of strong men from the village—and their dogs—to accompany him during his investigation of the purported haunting. Their mission: to spend the night within the mansion and see what occurs.