"American scientist Dr. Frank Smith is brought to Britain to help the C.I.A. There is a defecting East block scientist they want him to debrief. The commies are less than amused and set Dr. Smith up for a murder."
Anna Neagle
as Mary Randall, Q.C.
Anthony Quayle
as Dr. Frank Smith
Zsa Zsa Gabor
as Eve Trent
Katherine Kath
as Yvonne Delbeau
Dora Bryan
as Telephonist
Patrick Allen
as Jim Kennedy
Hugh McDermott
as Bernie
Leonard Sachs
as Professor Horvard
Edward Lexy
as Hobbs
John Paul
as John Castle
John Le Mesurier
as Judge
Anthony Sharp
as Baker
Anthony Pendrell
as Jury Foreman
David Aylmer
as Cross
Lloyd Lamble
as Bellamy
Neal Arden
as (uncredited)
Ballard Berkeley
as Court Clerk (uncredited)
Cyril Chamberlain
as Liftman (uncredited)
John Harvey
Jennifer Jayne
Diana King
Norman Mitchell
Guy Standeven
as Courtroom Spectator (uncredited)
Graham Stewart
John Tatum
as Man in Hotel Lobby (uncredited)
John Welsh
as George Fraser (uncredited)
Anthony Woodruff
Middleton Woods
Herbert Wilcox
Director
Ted Sturgis
Assistant Director
Denis Johnson
Production Manager
Fred Ryan
Sound
Edgar Lustgarten
Writer
Stanley Jackson
Producer
Gordon Dines
Cinematography
Stanley Black
Music
Basil Warren
Editor