The Mousetrap is a murder mystery play by Agatha Christie. The play opened in London's West End in 1952 and ran continuously until 16 March 2020, when the stage performances had to be temporarily discontinued during the COVID-19 pandemic. It then re-opened on 17 May 2021. The longest-running West End show, it also has by far the longest run of any play in the world, with its 29,500th performance having taken place as of February 2024. Attendees at St Martin's Theatre often get their photo taken beside the wooden counter in the theatre foyer. As of 2022 the play has been seen by 10 million people in London.