 This was Hickson, Joan (qv)s third appearance in 43 years in a  screen adaptation of an Christie, Agatha (qv) story or novel,  following _Love from a Stranger (1937)_ (qv) and  _Murder, She Said (1961)_ (qv). Hickson subsequently played  Christies character Jane Marple 12 times in 8 years in a series of  TV