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)

Reginald Denham

Director

Vincent Permane

Asistente de Dirección

Eric Marschwitz

Guión

Basil Mason

Guión, Adaptation

Val Gielgud

Novela

Eric Maschwitz

Novela

Günther Krampf

Director de Fotografía

Ord Hamilton

Compositor de la Música Original

Geoffrey Goodheart

Music Director

Phoenix Films

Compañía de Produccion

Hugh Perceval

Supervisor de Producción

Colin Becke

Diseño de Vestuario

Reginald Beck

Editor

R. Holmes Paul

Dirección Artística

John Cox

Sound Recordist