co-produced by Granada USA Productions and Wildwood Productions in association with WGBH Boston ; producer, Craig McNeil ; teleplay by Lloyd 'Lucky' Gold ; director, Jan Egleson
PBS ; a co-production of ITV Studios/Masterpiece ; produced by Chris Burt ; directors, David Drury, Matthew Evans, Nick Laughland ; writers, Nick Hicks-Beach, Helen Jenkins, Chris Murray
a co-production of ITA Studios Limited and WGBH Boston in association with Agatha Christie Ltd. ; produced by Karen Thrussell ; directed by Ashley Pearce, Philip Martin, and Dan Reed ; screenplays by Stewart Harcourt, Peter Flannery, and Guy Andrews