When Scotland Yard finds themselves up against a brick wall in tracking down a vicious gang of thieves and bank robbers, they call in Layton, a loner from MI5 to work his way into the gang and help bring them down.

William Sylvester
as Layton / Steve Ross

Mai Zetterling
as Ruth Lombard

John Meillon
as Johnny Hemick

Anthony Dawson
as James Dawson

Neil McCarthy
as Leo Farrell

Joseph Fürst
as Paul Varna

Harry Baird
as Gill Hall

John Phillips
as Chief Superintendent Gault

Victor Brooks
as Inspector Adams

Diana King
as Maggie Dawson