<P> The adaptation marks the second and final appearance of Countess Vera Rossakoff in this series, played here by Orla Brady . The prior appearance aired in 1991, in the episode The Double Clue, where Kika Markham played Countess Vera Rossakoff . </P> <P> Filming for this episode took place in April and May 2013 and was directed by Andy Wilson, who also directed Death on the Nile and Taken at the Flood for the series . Wilson described this adaptation as "a journey of restoration and redemption for Poirot ." </P> <P> The location in this adaptation, a Swiss hotel called "Hotel Olympos", was shot in Halton House in Aylesbury, however the bedrooms were built at Pinewood studios . </P> <Ul> <Li> 1947, Dodd Mead and Company (New York), 1947, Hardback, 265 pp </Li> <Li> 1947, Collins Crime Club (London), September 1947, Hardback, 256 pp </Li> <Li> 1951, Dell Books, Paperback, 255 pp </Li> <Li> 1953, Penguin Books, Paperback, (Penguin number 928), 254 pp </Li> <Li> 1961, Fontana Books (Imprint of HarperCollins), Paperback, 256 pp </Li> <Li> 1967, Greenway edition of collected works (William Collins), Hardcover, 319 pp </Li> <Li> 1967, Greenway edition of collected works (Dodd Mead), Hardcover, 319 pp </Li> <Li> 1978, Ulverscroft Large - print Edition, Hardcover, 467 pp; ISBN 0 - 7089 - 0119 - 0 </Li> </Ul>

Where was the labours of hercules poirot filmed
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