The Fourth Square. (1961 film).

The Police investigate a theft of emerald jewellery which had led to a murder.

Conrad Phillips as Bill Lawrence
Natasha Parry as Sandra Martin
Delphi Lawrence as Nina Stewart
Paul Daneman as Henry Adams
Miriam Karlin as Josette
Jacqueline Jones as Marie Labonne
Anthony Newlands as Tom Alvarez
Basil Dignam as Inspector Forbes
Harold Kasket as Philippe
Edward Rees as Sergeant Harris
Jack Melford as Stewart
Vilma Ann Leslie as Fiona Foster
Gwen Williams as Mrs. Potter
Barrie Ingham as Gordon
Constance Lorne as Lady in hairdressers
Rachel Lloyd as Receptionist
John Warwick as Police Sgt.
Keith Goodman as 1st Uniformed P.C.
Tom Gill as 2nd Uniformed P.C.
Edward de Souza as 1st Reporter
Marina Martin as 2nd Reporter
Peter Thomas as 3rd Reporter
Frank Porter as Compere
Nicolas Chagrin as Michel
George Hilsdon as Police Constable

Directed by Allan Davis