During a heavy snowstorm, newlyweds Mollie and Giles Ralston prepare to open Monkswell Manor for their first guests: the nitpicky Mrs. Boyle; the cagey Miss Casewell visiting from abroad; the young architect Christopher Wren; the good-natured Major Metcalf; and the roguish, unexpected guest Mr. Paravicini. As the snow proves impassable, Detective Sergeant Trotter arrives on skis with news that connects the manor to a mysterious murder in London. When the phone lines are cut and a guest turns up dead, everyone becomes a suspect. Will the killer be discovered in time? Discover for yourself why this Agatha Christie classic is the longest-running play in the world.