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Filmed in Ireland. Released in Great Britain in 1966. British sources list Towers as producer, and U. S. sources credit Unger. Christie's novel also inspired the 1945 U. S. film And Then There Were None. Peter Welbeck is a pseudonym for Harry Alan Towers. One source indicates that the screenplay is based on an adaptation by Welbeck of Dudley Nichols' script for the earlier film.