"A British policeman (John Gregson) tries to find a rich man's (Alec Clunes) son before a kidnapper's (Robert Shaw) time bomb blows."
John Gregson
as Inspector Parnell
Alec Clunes
as Anthony Chester
Robert Shaw
as Marlowe
Helen Cherry
as Robbie
Betty McDowall
as Maggie Parnell
William Hartnell
as Freddie Maddox
Harry Fowler
as Smiley
Alan Wheatley
as Assistant Commissioner Bewley
Kenneth Cope
as Sergeant Grey
Ernest Clark
as Police Doctor
Noel Howlett
as Brain Specialist
Renée Houston
as Masie Maddox
Piers Bishop
as Jonathan Chester
Frank Hawkins
as Mr. Tamplin
Ray Smith
as Mr. Briggs
Christopher Ellis
as Christopher Parnell
John Dunbar
as Sgt. Henry
Edward Rees
as Desk Sergeant
Robert Hunter
Anthony Ashdown
as Constable Jackson
Alan Curtis
as Inspector
Lance Comfort
Director
Bernie Fenton
Original Music Composer
Basil Emmott
Director of Photography
Jack Shampan
Art Direction
John Trumper
Editor
Peter Miller
Screenplay
James Kelley
Original Story
Peter Armston
Makeup Artist
Tom Blakeley
Producer