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Ian HunterDetective Inspector Gregory
Austin TrevorLeopold Dryden
Lilian OldlandJoan Dryden
Henry KendallRodney Fleming
Val GielgudJulian Caird
Peter HaddonGuy Bannister
Betty Ann DaviesPoppy Levine
Jack HawkinsHerbert Evans
Donald WolfitSydney Parsons
Robert RendelSir Herbert Farquharson
Gordon McLeodChief Commissioner
Hannen SwafferHannen SwafferVernon BartlettVernon BartlettEric DunstanEric DunstanGillie PotterGillie PotterElisabeth WelchElisabeth WelchEve BeckeEve BeckeGershom ParkingtonGershom ParkingtonPercival MackeyPercival Mackey
Ivor BarnardJoseph Higgins (uncredited)Cecil BevanPolice Doctor (uncredited)George De WarfazForeigner (uncredited)
Howard DouglasWeisskopf (uncredited)
Arthur HamblingMan on BBC Reception Desk (uncredited)Vincent HolmanDetective (uncredited)
Bruce LesterPeter Ridgwell (uncredited)Percy RhodesWife's Lover on Broadcast (uncredited)
