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

Costume & Make-Up

Writing

Costume & Make-Up

Editing

Production

Art

Camera

Writing

Production

Directing

Production

Sound

Sound

Sound

Sound

Camera

Directing

Lighting

Costume & Make-Up

Directing

Directing

Camera

Acting