A Record That Keeps Growing

The Mousetrap opened on 25 November 1952 at the Ambassadors Theatre and transferred to the neighbouring St Martin's Theatre in 1974, where it continues to this day. No other play in the world has come close to matching its run. It has been performed more than 29,000 times, survived cast changes numbering in the hundreds and outlived its own author by decades.

Agatha Christie originally wrote the story as a radio play called Three Blind Mice, broadcast by the BBC in 1947. She adapted it for the stage, and the producer Peter Saunders brought it to London expecting a run of perhaps eight months. Neither could have imagined it would still be running more than seven decades later. For more on the theatre district where it plays, see our guide to West End theatres.

Why It Has Lasted So Long

Part of the play's enduring appeal lies in its format. It is a classic whodunit set in a snowed-in guesthouse, with a small cast and a twist ending that audiences are famously asked not to reveal. This tradition of secrecy has become part of the show's identity and marketing, giving every performance a sense of shared conspiracy between the cast and the audience.

The play also benefits from being a relatively inexpensive production to mount. A small cast, a single set and no need for elaborate technical effects mean that running costs remain manageable. As long as audiences keep coming, there is little financial pressure to close.

The Tradition of Secrecy

At the end of every performance, the cast addresses the audience directly and asks them not to reveal the identity of the killer. This request has been honoured with remarkable consistency for over 70 years. It is one of the best-kept secrets in theatre, despite millions of people having seen the show.

The Theatre Itself

St Martin's Theatre is a relatively small venue, seating around 550 people. It was built in 1916 and sits on West Street, just off Cambridge Circus. The intimate scale suits The Mousetrap well, creating the claustrophobic atmosphere that the plot requires.

The theatre's foyer is filled with Mousetrap memorabilia, including photographs of the hundreds of actors who have appeared in the production over the decades. It functions as an informal museum of the show's history.

Other Long-Running West End Shows

While The Mousetrap holds the record for plays, the musical Les Miserables held the record for the longest-running musical in the West End from its opening in 1985 until it closed in 2024. The Phantom of the Opera also ran for decades, from 1986 to 2023.

Currently running musicals such as The Lion King and Wicked have accumulated impressive runs of their own, but none has yet approached the longevity of The Mousetrap. The distinction between plays and musicals matters here. The Mousetrap's record is for a straight play with no songs, which makes its endurance all the more remarkable given that musicals typically have broader commercial appeal. For a look at how London's theatre scene compares globally, see our guide to West End vs Broadway.

Visiting The Mousetrap

The show runs six days a week with matinee performances on selected afternoons. It attracts a mix of tourists, theatre enthusiasts and people who simply want to say they have seen the world's longest-running show. The experience is as much about participating in a piece of theatre history as it is about the plot itself.