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.