Murder was committed in London[edit] The victim's body, Maureen Lyon, is found with a notebook. Police announce on the radio that a suspect in the murder is wanted: a man in a gray coat, a light scarf and a felt hat In the boarding house “Monkswell-manor”, which belongs to a young married couple of Ralston, guests begin to gather Christopher Wren, Mrs. Boyle, Major Metkaf and Miss Casewell . Because of the snowfall, they find themselves locked in the house and read in the newspaper about the murder. Another guest arrives - Mr. Paravicini, whose car is stuck in the snow. Mrs. Boyle's manners annoy everyone present. Suddenly, a police officer arrives at the boarding house on skis, reporting that there will soon be a murder...