Michael and Pamela Wright are driving along in a terrible storm, when they see a man at the side of the road who is trying desperately to flag them down. The man is called Bill, and he's dressed in a railway uniform. He professes to have broken down, asking them for a lift to the nearby railway station. They agree and make their way to the station, where Bill asks them to join him for a hot cup of tea to get out of the storm for a while...