Television
British
The Mysterious Affair at Styles was adapted as an episode for the series Agatha Christie's Poirot on 16 September 1990; the episode was specially made by ITV to celebrate the centenary of the author's birth. The cast included David Suchet as Hercule Poirot, Hugh Fraser as Lieutenant Arthur Hastings and Philip Jackson as Inspector James Japp. It was filmed at Chavenage House in Gloucestershire, England.[17] The adaptation was generally faithful to Christie's story, although there were a number of deviations from it. The introduction of Poirot is greatly extended, including scenes of Poirot interrupting a military exercise, singing "It's a Long Way to Tipperary" with the Belgian refugees, and advising the post office of a better way to organize their products by country of origin. The adaptation also provided further elaboration on Hastings' first meeting with Poirot – the pair met during an investigation into a shooting, in which Hastings was a suspect.
Latvian
The novel was adapted as a TV miniseries for Latvijas Televīzija, titled "Slepkavība Stailzā". It was broadcast over 3 nights in 1990. The cast included Arnolds Liniņš as Puaro (Poirot's name in Latvian) and Romāns Birmanis as Hastingss (Hastings). Being a miniseries, with a total runtime of approximately 198 minutes, it included many details from the novel that were omitted from other shorter adaptations, and was generally faithful to the novel. One difference from the novel is that the inquest hearing is omitted, and instead there are more scenes from Džaps and Samerhejs (Japp and Summerhaye) searching for clues at Styles Court. Also, the ending sequence follows Christie's original unpublished version, where Poirot makes his final revelations in the courtroom.
French
It was adapted for an episode of Les Petits Meurtres d'Agatha Christie, which was broadcast in 2016. The series stars Samuel Labarthe as Swan Laurence, who replaces the character of Poirot in this adaptation. This version has many differences from the novel, but the core story is the same: a wealthy old woman is murdered by her husband together with her top business partner, who appear to hate each other but are secretly lovers. Certain aspects from the novel are retained, such as a disguise used to buy the poison with Eve Constantin (the character equivalent to Evelyn Howard) impersonating Adrien Sauvignac (the equivalent of Alfred Inglethorp), and the latter's deliberate attempt to get himself arrested so that he can produce his alibi. In this adaptation, Styles Court is a beauty spa instead of a country house.
Hungarian
In 2022, experimental Hungarian filmmaker Péter Lichter produced A titokzatos stylesi eset, a 65 minute adaptation. The film consisted of spliced footage from over 100 different silent films, combined with old school computer effects. Pál Mácsai provided narration as Poirot.[18]
Radio
The novel was adapted for radio by Michael Bakewell as a five-part serial in 2005, as part of the Hercule Poirot radio series for BBC Radio 4. The cast included John Moffatt as Poirot and Simon Williams as Captain Hastings. Inspector Japp was played by Philip Jackson, who had played the same role in the British television adaptation. The serial was broadcast weekly from 5 September to 3 October. All five episodes were recorded on 4 April 2005 at Bush House. This version retained the first-person narration by the character of Hastings.[19]
Stage
On 14 February 2012, Great Lakes Theater in Cleveland, Ohio debuted a 65-minute stage adaptation as part of their educational programming. Adapted by David Hansen, this production is performed by a cast of five (3 men, 2 women) with most performers playing more than one role.[20]
On 17 March 2016, the Hedgerow Theatre company in Media, Pennsylvania, premiered an adaptation by Jared Reed. While largely faithful to the novel, the character of Inspector Japp was omitted.[21]
