Question: What was the nationality of the director of a 1945 film adaptation of an Agatha Christie novel?

Context articles: Royal Castle Hotel
Agatha Christie Award (Japan)
Thirteen at Dinner (film)
The Body in the Library (film)
Innocent Lies
And Then There Were None (1945 film)
The Act of Roger Murgatroyd
Nemesis (Christie novel)
The Sittaford Mystery
René Clair

The Royal Castle Hotel is a hotel in Dartmouth, Devon, England.
 Guests have included Queen Victoria, Sir Francis Drake, and Mary (who later became Mary II of England).
 The hotel was used as a location for the 1984 film, "Ordeal by Innocence", which was based on the 1958 Agatha Christie novel of the same name.
 Agatha Christie renamed the hotel the Royal George in 'The Regatta Mystery', a short story that first appeared in The Strand Magazine in 1936 and which currently forms part of the 1991 short story collection Problem at Pollensa Bay.
 It holds three stars in the AA rating system and looks across Dartmouth Harbour and the River Dart estuary.
The Agatha Christie Award (アガサ・クリスティー賞 ) is a Japanese literary award established in 2010 in commemoration of the 120th anniversary of Agatha Christie's birth.
 The award is presented by Hayakawa Publishing Corporation in association with the Agatha Christie Society, which is chaired by Mathew Pritchard, the grandson of Agatha Christie.
Thirteen at Dinner is a 1985 British-American made-for-television mystery film featuring the Belgian detective Hercule Poirot.
 Adapted by Rod Browning from the Agatha Christie novel "Lord Edgware Dies", it was directed by Lou Antonio and starred Peter Ustinov, Faye Dunaway, Jonathan Cecil, Diane Keen and Bill Nighy.
 David Suchet, later to play Poirot in the long-running television series entitled "Agatha Christie's Poirot", played the role of Inspector Japp.
 Suchet considers his performance as Japp to be "possibly the worst performance of [his] career."
The Body in the Library is a 1984 television film adaptation of Agatha Christie's 1942 detective novel "The Body in the Library", which was co-produced by the BBC and the A&E Network.
 The film uses an adapted screenplay by T. R. Bowen and was directed by Silvio Narizzano.
 Starring Joan Hickson in the title role, it was the first film presented in the British television series "Miss Marple" and premiered in three parts from 26 to 28 December 1984 on BBC One.
 In the United States the film was first broadcast on 4 January 1986 as a part of PBS's "Mystery!
".
 In his review in "The New York Times", critic John J. O'Connor wrote: "Miss Christie would no doubt approve of Joan Hickson, the veteran British character actress who plays Miss Marple... This BBC/Arts & Entertainment co-production offers an especially good example of Agatha Christie in adaptation.
 The characters are nicely realized and the suspense holds.
 Miss Hickson is lovely, neither as awesome as Miss Rutherford nor as overly cute as Helen Hayes.
 And the supporting cast is admirable, particularly Gwen Watford as Dolly and David Horovitch as Inspector Slack.
 As someone notes about the case, 'you'll have to admit it has all the bizarre elements of a cheap thriller.'
 Once hooked, you won't be able to turn it off."
Innocent Lies is a 1995 British-French thriller film directed by Patrick Dewolf and starring Stephen Dorff, Gabrielle Anwar, Adrian Dunbar and Joanna Lumley.
 It is a loose adaptation of the Agatha Christie novel "Towards Zero".
 Keira Knightley had an early role in the film, playing the younger version of Celia Graves, the character portrayed by Anwar.
 Its French title was Les Pêchés mortels.
And Then There Were None is a 1945 film adaptation of Agatha Christie's best-selling mystery novel of the same name, directed by René Clair.
 It was released in the UK with the title Ten Little Indians, in line with the UK title of Christie's novel.
The Act of Roger Murgatroyd: An Entertainment is a whodunit novel written by Scottish novelist Gilbert Adair first published in 2006.
 Set in the 1930s and written in the vein of an Agatha Christie novel, it has all the classic ingredients of a 1930s mystery and is, according to the author, "at one and the same time, a celebration, a parody and a critique not only of Agatha Christie but of the whole Golden Age of English whodunits", but also "a whodunit in its own right, so that those readers who were completely uninterested in literary games of the so-called postmodern type could nevertheless settle down comfortably with a good, gripping and intentionally old-fashioned thriller".
 "The Act of Roger Murgatroyd" is also a locked room mystery.
Nemesis is a work of detective fiction by Agatha Christie (1890–1976) and first published in the UK by the Collins Crime Club in November 1971 and in the US by Dodd, Mead and Company later in the same year.
 The UK edition retailed at £1.50 and the US edition at $6.95.
 It was the last Miss Marple novel the author wrote, although "Sleeping Murder" was the last Christie novel to be published.
The Sittaford Mystery is a work of detective fiction by Agatha Christie, first published in the US by Dodd, Mead and Company in 1931 under the title of The Murder at Hazelmoor and in UK by the Collins Crime Club on 7 September of the same year under Christie's original title.
 It is the first Christie novel to be given a different title for the US market.
 The US edition retailed at $2.00 and the UK edition at seven shillings and sixpence (7/6).
René Clair (11 November 1898 – 15 March 1981) born René-Lucien Chomette, was a French filmmaker and writer.
 He first established his reputation in the 1920s as a director of silent films in which comedy was often mingled with fantasy.
 He went on to make some of the most innovative early sound films in France, before going abroad to work in the UK and USA for more than a decade.
 Returning to France after World War II, he continued to make films that were characterised by their elegance and wit, often presenting a nostalgic view of French life in earlier years.
 He was elected to the Académie française in 1960.
 Clair's best known films include "The Italian Straw Hat" (1928), "Under the Roofs of Paris" (1930), "Le Million" (1931), "À nous la liberté" (1931), "I Married a Witch" (1942), and "And Then There Were None" (1945).