In 1920s England, a group of upper-class people take part in an automobile race to Land's End. One couple, Billy and Daphne, get lost in heavy fog and run out of petrol. Billy goes to look for fuel, but takes so long that Daphne strikes out on her own. She eventually locates a rural estate owned by Dr. Lawrence, a former priest. He receives her kindly and sends his disturbed gardener, Tom, to find Billy. Tom finds and murders Billy, and pushes the car into a ravine; it is implied that he acted on his employer's orders.