A Window in London

Peter (Michael Redgrave) a crane operator and Pat (Patricia Roc) a hotel switchboard operator and his patient wife are a happy well meaning couple. While he works during the day on the construction of Waterloo Bridge, Pat works the night on a hotel telephone exchange. One morning on his way to work, Peter spots what seems to be a murder being committed on at the open window of a building overlooking the tracks. Deciding to investigate this "crime" Peter and a policeman arrive at the residence they find out that the couple were in fact rehearsing an illusion.