Reginald Denham (Director)
Ian Hunter
Detective Inspector Gregory
Austin Trevor
Leopold Dryden
Lilian Oldland
Joan Dryden
Henry Kendall
Rodney Fleming
Val Gielgud
Julian Caird
Peter Haddon
Guy Bannister
Betty Ann Davies
Poppy Levine
Jack Hawkins
Herbert Evans
Donald Wolfit
Sydney Parsons
Robert Rendel
Sir Herbert Farquharson
Gordon McLeod
Chief Commissioner
Hannen Swaffer
Hannen Swaffer
Vernon Bartlett
Vernon Bartlett
Eric Dunstan
Eric Dunstan
Gillie Potter
Gillie Potter
Elisabeth Welch
Elisabeth Welch
Eve Becke
Eve Becke
Gershom Parkington
Gershom Parkington
Percival Mackey
Percival Mackey
Ivor Barnard
Joseph Higgins (uncredited)
Cecil Bevan
Police Doctor (uncredited)
George De Warfaz
Foreigner (uncredited)
Howard Douglas
Weisskopf (uncredited)
Arthur Hambling
Man on BBC Reception Desk (uncredited)
Vincent Holman
Detective (uncredited)
Bruce Lester
Peter Ridgwell (uncredited)
Percy Rhodes
Wife's Lover on Broadcast (uncredited)
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An actor is murdered live on air whilst a play is being broadcast. Everyone in the play and broadcasting house fall under suspicion.
