In a remote house in the middle of Dartmoor, six figures huddle for a séance. Tension rises as the spirits spell out a chilling message: ‘Captain Trevelyan… dead… murder.’ Black magic or a macabre joke? The only way to know is to locate Captain Trevelyan. Unfortunately, his home is six miles away and, with snow drifts blocking the roads, someone will have to make the journey on foot…