Maj. John Tarrant

Cedric Harper

Ceil Burrows

Alf Chestermann

McKee

Chief Supt. Wray

Alex Tarrant

Lady Melissa Julyan

Sir Edward Julyan

Bateson

Monitoring Policeman

Mike McCarthy

Jane Harper

Miss Monley

Ilkeston

Margaret

MI5 Man

Hetty

Gen. St. John

Jacques (uncredited)

Shadow (uncredited)

Doctor (uncredited)

M15 Man (uncredited)

Pincus (uncredited)

Secretary (uncredited)

Jeweller (uncredited)

M15 Man (uncredited)

Manageress (uncredited)

Commuter (uncredited)

Tourist (uncredited)

Customs Officer (uncredited)

Directing

Writing

Editing

Art

Costume & Make-Up

Costume & Make-Up

Production

Camera

Production

Writing

Directing

Acting

Sound

Directing

Sound

Sound

Production

Sound

Directing

Directing

Camera

Lighting

Costume & Make-Up

Camera