Main Page | See live article | Alphabetical index The Mousetrap is a whodunnit in the form of a stage play by Agatha Christie. It opened on November 25, 1952 at the Ambassadors Theatre in London, and moved to St. Martin's Theatre in 1974. The play had its 20,000th performance on December 16, 2000. It is claimed to be the world's longest running play. A staging at the Toronto Truck Theatre in Canada that opened on August 19, 1977 is claimed to be North America's longest running show. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.