"Men from Scotland Yard and military intelligence build a dossier on a sabotage ring."
Liam Redmond
as Cmdr. Robert Brennan
André Morell
as Supt. Folland
Kenneth Griffith
as Jimmy Ellis
Anthony Bushell
as Maj. Elliott
Mary Morris
as Anna Braun
Joan Hickson
as Mrs. Ellis
Anthony Nicholls
as Grant Mansfield
Geoffrey Keen
as Morgan Williams
John Bailey
as Stringer
Patric Doonan
as George Ellis
Dora Bryan
as Mrs. Bowers
Stuart Lindsell
as Commissioner
John Harvey
as Scotland Yard Man
Charles Lloyd Pack
as Percy Ward
Laurence Naismith
as Reginald Gordon-Wells
Jack McNaughton
as Benson - Scotland Yard man
Julian Amyes
as Slater
Alfie Bass
as Albert Brewer (uncredited)
Hélène Burls
as Mrs Skinner (uncredited)
Basil Cunard
as Pier Superintendant (uncredited)
Harry Fowler
as Street photographer (uncredited)
Everley Gregg
as Mrs Finch-Harvey - Music Club member (uncredited)
George Hilsdon
as Detective (uncredited)
Glyn Houston
as Railway shunter (uncredited)
Douglas Ives
as Mr Mathews - Union Rep (uncredited)
Moultrie Kelsall
as Ship's Captain (uncredited)
Sam Kydd
as Sam - Printer (uncredited)
Victor Maddern
as Anarchist (uncredited)
Julien Mitchell
as Mr Philips - Union Rep (uncredited)
Julian Somers
as Scottish Police Sergeant (uncredited)
Marianne Stone
as Alfie's Mother (uncredited)
John Warwick
as Inspector Hewitt (uncredited)
Lockwood West
as Home Secretary (uncredited)
Bruce Seton
as (uncredited)
Richard Shaw
as Man Dining in Cafe (uncredited)
Howard Lang
as Policeman Discovering Jimmy's Body (uncredited)
Pauline Winter
as Miss Laurie - Music Club member (uncredited)
Jean Anderson
as Woman in street (uncredited)
Hyma Beckley
as Music Club member (uncredited)
John Boxer
as Ship's radio operator (uncredited)
Cyril Conway
Philip Dale
as Man serving in cafe (uncredited)
Andrew Donally
as Printer's assistant (uncredited)
Victor Harrington
as Police clerk (uncredited)
Stephen Jack
as Police Inspector (uncredited)
Barry Johns
as Student exiting Tutorial College (uncredited)
Peter Jones
as Announcer at Music Club (uncredited)
as Policeman (uncredited)
Frank Ling
as Telephone engineer (uncredited)
Harry Locke
as Andy - Telephone engineer (uncredited)
Richard Massingham
as Music Society member (uncredited)
Dandy Nichols
as Woman scrubbing porch step (uncredited)
Tony Quinn
as Chemistry lecturer (uncredited)
Bill Rayment
as Power station worker (uncredited)
Charles Rolfe
as Policeman at Records Office (uncredited)
Reg Thomason
Joe Wadham
Michael Ward
John Warren
as Barman (uncredited)
Ian Wilson
as Glass collector (uncredited)
Roy Boulting
Screenplay
Director
Frank Harvey
Alex Vetchinsky
Set Decoration
Max Benedict
Editor
Paul Soskin
Producer
Gilbert Taylor
Director of Photography
Biddy Chrystal
Hairstylist
John Addison
Music
W.T. Partleton
Makeup Artist
Ray Sturgess
Camera Operator
