A blizzard has hit England. In the tiny village of Sittaford, on the fringes of Dartmoor, a party of six is gathered in Sittaford House, home of Captain Trevelyan. He has rented the house out for the winter and is staying in a nearby village. As evening draws in, a seance is proposed. The lights are lowered and the table turning begins: various questions are asked, and the guests are delighted when the table jerks and rocks, revealing the answers. But the game turns sour when the board spells out a terrible message - TREVELYAN DEAD. As the horrified participants look on, the table begins to rock again, and fear grips the party as the sinister word appears - MURDER. Is it a macabre joke, black magic or the truth? And who would kill a man who doesn't have an enemy in the world?