- Rachel Gurney - Clara Holland
- Martin Stephens - John Holland
- Waveney Lee - Marcia Holland
- Charles Carson - Robert Holland
- Junia Crawford - Susan
- Henry B. Longhurst - Club Member (as Henry Longhurst)
- Roger Maxwell - Club Member
- Gerald Case - Club Member
- Donald Bisset - Club Member
- Desmond Roberts - Club Member
- Reginald Smith - Club Steward
- MacDonald Parke - Jason Parrish (as Macdonald Parke)
- Mavis Villiers - Adele Parrish
- Ernest Clark - Cmdr. Bates
- Alexander Archdale - Local Doctor (uncredited)
- Basil Dignam - Lt. Cmdr. Evans at P.R.O. (uncredited)
- Gordon Harris - 2nd Special Branch Man Jones (uncredited)
- Barbara Hicks - Miss Price (uncredited)
- John Horsley - 1st Editor (uncredited)
- John Le Mesurier - Head of the Admiralty (uncredited)
- Ronald Leigh-Hunt - 2nd Editor (uncredited)
- Richard Marner - Russian Officer Cornered by Max Easton (uncredited)
- William Mervyn - Capt. Balfour (uncredited)
- Andre Mikhelson - 2nd Russian Officer (uncredited)
- Dickie Owen - 2nd Policeman (uncredited)
- Frederick Piper - Hall Porter (uncredited)
- Pat Ryan - Nightclub Patron (uncredited)
- Stanley Zevic - 1st Russian Officer (uncredited)
- Guy Hamilton
- Guy Hamilton
- Irene Howard
James Mason interpreta a Cmdr. Max Easton en la película.
George Sanders interpreta a Sir Charles Holland en la película.
Vera Miles hace el papel de Virginia Killain.
Robert Flemyng hace el papel de Cmdr. John Larkin.
Oliver Johnston interpreta a Minister en la película.
William Kendall interpreta a Tom en la película.
Duncan Lamont interpreta a 1st Special Branch man Gregson en la película.
Harry Andrews interpreta a Capt. Graham en la película.
Peter Barkworth interpreta a Sub Lt. Brown en la película.
Rachel Gurney interpreta a Clara Holland en la película.
Martin Stephens hace el papel de John Holland.
Waveney Lee interpreta a Marcia Holland en la película.
Charles Carson interpreta a Robert Holland en la película.
Junia Crawford interpreta a Susan en la película.
Henry B. Longhurst interpreta a Club Member (as Henry Longhurst) en la película.
Roger Maxwell interpreta a Club Member en la película.
Gerald Case interpreta a Club Member en la película.
Donald Bisset hace el papel de Club Member.
Desmond Roberts hace el papel de Club Member.
Reginald Smith hace el papel de Club Steward.
MacDonald Parke interpreta a Jason Parrish (as Macdonald Parke) en la película.
Mavis Villiers interpreta a Adele Parrish en la película.
Ernest Clark interpreta a Cmdr. Bates en la película.
Alexander Archdale interpreta a Local Doctor (uncredited) en la película.
Basil Dignam interpreta a Lt. Cmdr. Evans at P.R.O. (uncredited) en la película.
Mabel Etherington interpreta a Nightclub Patron (uncredited) en la película.
Gordon Harris interpreta a 2nd Special Branch Man Jones (uncredited) en la película.
Barbara Hicks hace el papel de Miss Price (uncredited).
John Horsley interpreta a 1st Editor (uncredited) en la película.
Frederick Kelsey interpreta a Club Member (uncredited) en la película.
John Le Mesurier interpreta a Head of the Admiralty (uncredited) en la película.
Ronald Leigh-Hunt interpreta a 2nd Editor (uncredited) en la película.
Richard Marner interpreta a Russian Officer Cornered by Max Easton (uncredited) en la película.
William Mervyn interpreta a Capt. Balfour (uncredited) en la película.
Andre Mikhelson interpreta a 2nd Russian Officer (uncredited) en la película.
John More interpreta a American General at Embassy Party (uncredited) en la película.
Dickie Owen interpreta a 2nd Policeman (uncredited) en la película.
Frederick Piper interpreta a Hall Porter (uncredited) en la película.
Pat Ryan hace el papel de Nightclub Patron (uncredited).
Stanley Zevic interpreta a 1st Russian Officer (uncredited) en la película.
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