Alibi is a 1928 play by Michael Morton based on The Murder of Roger Ackroyd, a 1926 novel by British crime writer Agatha Christie.

It opened at the Prince of Wales Theatre in London's West End on 15 May 1928, starring Charles Laughton as Hercule Poirot.

Retitled The Fatal Alibi, the play was first presented on Broadway in February 1932; the production was directed by Laughton, who reprised the role of Poirot.

[3] The residents of Fernley Park, the home of Sir Roger Ackroyd, discuss the suicide of a local woman, Mrs. Ashley Ferrars, during the previous night.

An attractive neighbor, Caryl Sheppard, arrives to play bridge, followed by Hercule Poirot, who has recently moved to the village.

Houseguest Major Blunt also says he heard the words when he was walking on the terrace, but was distracted by a woman in white moving about the grounds.

The next morning, Poirot summons the butler, Parker, and asks him to state what is different about the study compared to the previous evening.

Mr Hammond, the family solicitor, reveals that the dead man's will leaves the majority of the estate to Paton.

The review in The Times issue of 16 May 1928 questioned "whether you can make a play out of theoretical analysis" and went on to praise Laughton's performance as Poirot.

[4] The Guardian of 16 May 1928 expressed similar sentiments, saying "we can hardly resist the play despite its wheezy start and inability to accelerate, because M. Poirot is presented in the flesh by Mr. Charles Laughton, who, unlike much youth of brilliant hopes, continues to perform almost more than he so lavishly promised".

Mr. Morton, indeed, had a difficult job to perform in dramatising the novel, for the cleverness of Mrs. Christie's story lies not so much in the plot as in the fact that it is told by the murderer.

[6] The Scotsman of 16 May 1928 said, "It is a tribute to Mr Michael Morton…that during the play…one completely ignored the many weaknesses in the chain of evidence that bought the guilt home to the murderer of Sir Roger Ackroyd."

Sir Gerald du Maurier has produced the piece according to that modern fashion in which people move quietly, behave credibly and often sit with their backs to the audience when speaking.

[9] Laughton also starred in and directed the Broadway production, retitled The Fatal Alibi which opened at the Booth Theatre on 9 February 1932[10] with settings by Dale Stetson and produced by Jed Harris.

[14] A radio version of the play was presented on the BBC Home Service on 17 June 1944 from 9.20 to 10.35pm as part of the Saturday Night Theatre strand.