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 behind the haunting once and for all: they each draw a card, and whoever pulls the Ace of Spades must spend a night in that terrifying room.