They say that Lord Mantling's mansion is haunted--at least, one room of it is. Known as the Red Widow's Chamber, the now-sealed quarters once housed the wife of a guillotine operator in the French Revolution and, since her passing, have been host to a century of unsolved horrors including the death of a man in 1802, the death of a child in 1895, and a number of mysterious mortalities in the years in between. Now, in 1935, eight men and women join at the manor for a sinister experiment to determine the truth once and for all: they each draw a card, and whoever pulls the Ace of Spades must spend a night in the terrifying room. But the challenge turns fatal when the man selected for the task is found poisoned the next morning when the chamber is unlocked.