This typically excellent Otto Preminger film screens as part of the Marilyn Monroe season at BFI Southbank. The movie also screens on 15 June. Full details here.
Chicago Reader review:
Marilyn Monroe and Robert Mitchum search for her missing husband in this excellent 1954 western by Otto Preminger, one of the first films to discover the potential of CinemaScope and a fine example of Preminger's rational approach to the mysteries of personal morality.
Here (and above) is the trailer.