The Mousetrap is a murder mystery play by Agatha Christie. The longest-running West End show, it also has by far the longest run of any play in the world, reaching its 30,000th performance on 19 March 2025. 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. As of 2022 the play had been seen by 10 million people in London.
A whodunit, the play has a twist ending which the audience are traditionally asked not to reveal after leaving the theatre. There are eight members of the cast, and by 2012 more than 400 actors had played the roles. Richard Attenborough was the original Detective Sergeant Trotter, and his wife, Sheila Sim, the first Mollie Ralston â owner of Monkswell Manor guesthouse. Since then few of the cast have been headliners, with Stephen Moss in The Guardian writing that "the play and its author are the stars".
The play began life as a short radio play written by Agatha Christie as a birthday present for Queen Mary, the consort of King George V. It was broadcast on 30 May 1947 under the name Three Blind Mice. The story drew from the real-life case of Dennis O'Neill, who died after he and his brother Terence suffered extreme abuse while in the foster care of a Shropshire farmer and his wife in 1945.
The play is based on a short story, itself based on the radio play, but Christie asked that the story not be published as long as it ran as a play in the West End of London. The short story has still not been published within the UK but it has appeared in the US in the 1950 collection Three Blind Mice and Other Stories.
When she wrote the play, Christie gave the rights to her grandson Mathew Prichard as a birthday present. In the United Kingdom, only one production of the play in addition to the West End production can be performed annually, and under the contract terms of the play, no film adaptation can be produced until the West End production has been closed for at least six months. Producer John Woolf bought the film rights to the play in 1956, but Woolf and his heirs have been unable to produce an adaptation because the play has never closed. Woolf's son Jonathan hired Stuart Urban to write a screenplay for an adaptation of the play in the late 1990s, but the play's producers blocked Woolf from making the film. After unsuccessfully attempting to acquire the film rights to the play, Damian Jones was inspired to produce a film more loosely based on the play. Jones' idea became the 2022 film See How They Run, a murder mystery which takes place at the West End production of The Mousetrap in 1953, in which the murder victim is a director who has been hired to direct a film adaptation of the play.
The play had to be renamed at the insistence of Emile Littler, who had produced a play called Three Blind Mice in the West End before the Second World War. The suggestion to call it The Mousetrap came from Christie's son-in-law, Anthony Hicks.
The play's longevity has ensured its popularity with tourists from around the world. In 1997, at the initiative of producer Stephen Waley-Cohen, the theatrical education charity Mousetrap Theatre Projects was launched, helping young people experience London's theatre.
Tom Stoppard's 1968 play The Real Inspector Hound parodies many elements of The Mousetrap, including the surprise ending.
As a stage play, The Mousetrap had its world premiere at the Theatre Royal, Nottingham, on 6 October 1952. It was originally directed by Peter Cotes, elder brother of John and Roy Boulting, the film directors. Its pre-West End tour then took it to the New Theatre Oxford, the Manchester Opera House, the Royal Court Theatre, Liverpool, the Theatre Royal, Newcastle, the Grand Theatre Leeds and the Alexandra Theatre in Birmingham, before it began its run in London on 25 November 1952 at the Ambassadors Theatre. It ran at this theatre until Saturday, 23 March 1974 when it immediately transferred to the larger St Martin's Theatre, next door, where it reopened on Monday, 25 March, thus keeping its "initial run" status. The London run has now exceeded 30,000 performances. David Turner was the director of the play from 1987 to 2004.
Christie herself did not expect The Mousetrap to run for such a long time. In her autobiography, she reports a conversation that she had with Peter Saunders: "Fourteen months I am going to give it", says Saunders. To which Christie replies, "It won't run that long. Eight months perhaps. Yes, I think eight months." When it broke the record for the longest run of a play in the West End in September 1957, Christie received a mildly grudging telegram from fellow playwright Noël Coward: "Much as it pains me I really must congratulate you ..." In 2011 (by which time The Mousetrap had been running for almost 59 years), this long-lost document was found by a Cotswold furniture maker who was renovating a bureau purchased by a client from the Christie estate. By the time of Christie's death in 1976, the play had made more than ã3 million. Prichard, who was only nine when he was given the copyright of the play, set up the Colwinston Charitable Trust in 1995 to use the money from productions of the play. The trust supports charities for the arts, mainly in Wales.
The original West End cast included Richard Attenborough as Detective Sergeant Trotter and his wife Sheila Sim as Mollie Ralston. They took a 10% profit-participation in the production, which was paid for out of their combined weekly salary ("It proved to be the wisest business decision I've ever made ... but foolishly I sold some of my share to open a short-lived Mayfair restaurant called 'The Little Elephant' and later still, disposed of the remainder in order to keep Gandhi afloat.")
Since the retirement of Mysie Monte and David Raven, who each remained in the cast for more than 11 years as Mrs Boyle and Major Metcalf, the cast has been changed annually. The change usually occurs around late November around the anniversary of the play's opening, and was the initiative of Sir Peter Saunders, the original producer. There is a tradition of the retiring leading lady and the new leading lady cutting a "Mousetrap cake" together.
The late Deryck Guyler can still be heard, via a recording, reading the radio news bulletin in the play. The set was changed in 1965 and 1999, but one prop survives from the original opening â the clock which sits on the mantelpiece of the fireplace in the main hall.
Notable milestones in the play's history include:
In May 2001, during the London production's 49th year, and to mark the 25th anniversary of Christie's death, the cast gave a semi-staged Sunday performance at the Palace Theatre, Westcliff-on-Sea as a guest contribution to the Agatha Christie Theatre Festival 2001, a 12-week cycle of all of Christie's plays presented by Roy Marsden's New Palace Theatre Company.
Performances at the St. Martin's Theatre were halted on 16 March 2020, along with all other West End shows, during the COVID-19 pandemic in the United Kingdom. The Mousetrap re-opened on 17 May 2021 after 14 months without performances.
A staging at the Toronto Truck Theatre in Toronto, Ontario, that opened on 19 August 1977 became Canada's longest running show, before finally closing on 18 January 2004 after a run of 26 years and over 9,000 performances.
On 18 November 2012, both the 25,000th performance and the 60th year of the production were marked by a special charity performance which featured Hugh Bonneville, Patrick Stewart, Julie Walters and Miranda Hart. The money raised by the performance went towards Mousetrap Theatre Projects.
During the sixtieth anniversary year of The Mousetrap, a touring production visited regional theatres for the first time, whilst the London run continued uninterrupted.
The play has also been presented in 2013 in Singapore, Kuala Lumpur and Bangkok by the British Theatre Playhouse. The play has been staged in Queensland, Australia several times. In September 2011, it was staged at The Mousetrap Theatre in Redcliffe, the theatre group having been named after Christie's play. From July to August 2019, the Toowoomba Repertory Theatre Society performed the play in their home city. In November 2022, The Mousetrap was performed in Brisbane, the state's capital. In December 2022, after more than 70 years, the first Broadway production of The Mousetrap was announced to be staged in 2023 with an all-American cast.
The murderer's identity is divulged near the end of the play, in a twist ending that is unusual for playing with the very basis of the traditional whodunnit formula, where the cliché is that the detective solves the crime and exposes the remaining plot secrets. By tradition, at the end of each performance, audiences are asked not to reveal the identity of the killer to anyone outside the theatre, to ensure that the end of the play is not spoiled for future audiences.
Christie was always upset by the plots of her works being revealed in reviews. In 2010, her grandson Mathew Prichard, who receives the royalties from the play, said he was "dismayed" to learn from The Independent that the ending to The Mousetrap had been described in the play's Wikipedia article.
Duncan Leatherdale of BBC News contrasted the play to other works like Psycho and The Sixth Sense, where the plot twist has been revealed and became itself an element of popular culture.
The play is set in the Great Hall of Monkswell Manor, Berkshire, in what Christie described as "the present".
Monkswell Manor is a recently converted guesthouse run by a young couple, Mollie and Giles Ralston. Mollie listens to a radio report about the murder of a woman named Maureen Lyon in Paddington, London; police are looking for a man in a dark overcoat.
Their first four guests arrive: Christopher Wren, Mrs Boyle, Major Metcalf, and Miss Casewell. Christopher is an unkempt, flighty young man; Mrs Boyle is a constant complainer; Metcalf is an amiable ex-military man; and Miss Casewell is a mannish young woman. An unexpected fifth guest, Mr Paravicini, says his car has overturned in a snowdrift and the denizens of the house are snowed in. Uneasy, Mollie nevertheless places Paravicini in the last remaining room.
The next afternoon, Sergeant Trotter of the Berkshire Police arrives at the guesthouse on skis, while Metcalf discovers that the phone has stopped working. Trotter explains he has been sent regarding the murder of Maureen Lyon. The dead woman and her husband had mistreated their three foster children, the Corrigans, which resulted in the youngest's death. Police suspect the killer is the elder Corrigan boy, who would now be twenty-two.
A notebook at the murder scene contained the address of Monkswell Manor and the words "Three Blind Mice", while a note reading "This is the First" was pinned to the woman's body. Giles, Mollie, and all five guests deny a connection to the case. Afterward, Metcalf confronts Mrs Boyle, revealing that she was one of the magistrates who had assigned the children to the foster parents.
Later in the evening, Mrs Boyle wanders back into the now-empty room. The opening notes of "Three Blind Mice" are heard whistled by an unknown party and the lights go out. Moments later, Mollie finds Mrs Boyle dead on the floor.
Sergeant Trotter takes charge of the household, gathering the remaining residents together. Mollie cannot provide him with any useful clues. As each person recounts their whereabouts, Trotter observes various weaknesses in their stories, declaring that everyone had the opportunity to commit the murder. Giles counters that only one person fits the suspect's description: Christopher Wren, who insists that it is all a frame-up.
Trotter adds that the dead boy had other relatives and loved ones who might be interested in revenge, meaning that anyone in the guesthouse could be the killer. He also notes that both Giles and Mollie had secretly been in London on the day of the first murder. Trotter forces the aghast Mollie to admit that the couple knows little about each other's pasts. Christopher Wren later confesses to Mollie that he is actually an army deserter under a false name, and Mollie acknowledges that she, too, is running away from her past.
Again calling the household together, Trotter declares that he intends to check everyone's alibis. They will re-enact the murder; each person will act out another's alibi, with the hope that one alibi will be proved impossible. The household obediently disperses, leaving Trotter alone onstage.
Trotter calls for Mollie and reveals he knows she was the schoolteacher of the Corrigan children. She failed to answer a letter the younger boy sent her, begging to be rescued from foster care. Due to illness, Mollie did not read the letter until after the boy's death; she is haunted by her failure to help.
Trotter points a gun at Mollie, telling her that he is not a real policeman and that he cut the house's telephone wires. He is actually Georgie, the elder Corrigan brother. He begins to strangle Mollie, but is stopped by the sudden appearance of Miss Casewell. She calls him by name and reveals that she is his long-lost sister Kathy, come to take him somewhere safe.
Metcalf discloses that he himself is an undercover policeman; he arranged to replace the real Metcalf at the guesthouse to investigate and hid Trotter's skis after growing suspicious, preventing Trotter from escaping. Giles and Mollie admit that they were both secretly in London buying presents, as today is their first wedding anniversary.
The play made little stir in the review pages of the British press when it opened. The Manchester Guardian commented that it was "a middling piece" with "less in it than meets the eye ... Coincidence is stretched unreasonably." The critic commented that the characters were "built entirely of clichés". The reviewer in The Times was more favourably disposed to the characters, calling them "nicely assorted, individually labelled and readily identified", and found the plot "elaborately skilful." In The Daily Express, John Barber praised "the atmosphere of shuddering suspense" but thought some of the characters "too obvious by half". In The Illustrated London News, J. C. Trewin commented that those who failed to spot the killer would probably call the plot "preposterous and over-burdened", but those who succeeded might be more kindly disposed.
The play was published as a paperback by Samuel French Ltd as French's Acting Edition No. 153 in 1954 and is still in print. It was first published in hardback in The Mousetrap and Other Plays by G. P. Putnam's Sons in 1978 ().
In 1959, it was announced that Edward Small, who had produced Witness for the Prosecution for the screen, was to make a film version of the play in co-production with Victor Saville for United Artists. Tyrone Power and Maria Schell were named as leads. However, no film resulted. In 1960, the Bengali author Premendra Mitra directed a film Chupi Chupi Aashey, based on the radio play and short story. In 1980, it was adapted into an Egyptian feature length television drama titled ÃÂÃÂïàçÃÂöÃÂçÃÂç (Fondoa Al Dahaia, Hotel of Victims) that featured Egyptian actor Ahmed Zaki, in one of his earlier performances, in the role of the Detective. In 1990, Russian film director Samson Samsonov directed a film titled ÃÂÃÂÃÂõûþòúð (Myshelovka, English: The Mousetrap) at Mosfilm. The script by Vladimir Basov is based on Christie's play.
In 2022, the story of a British-American film See How They Run was set in the Ambassadors Theatre and concerned in-story actors of The Mousetrap, following murders of personnel involved in the production of and linked to the play.