A group of strangers is stranded in a boarding house during a snow storm, one of whom is a murderer. The suspects include the newly married couple who run the house, and the suspicions in their minds nearly wreck their perfect marriage. Others are a spinster with a curious background, an architect who seems better equipped to be a chef, a retired Army major, a strange little man who claims his car has overturned in a drift, and a jurist who makes life miserable for everyone. Another famous Agatha Christie switch finish!