Supt Tom Halliday

Jack Hawkins

Acting

Sergeant Ward

John Stratton

Acting

Mary Halliday

Dorothy Alison

Acting

Tony Halliday

Michael Brooke

Acting

Police Constable in Information Room

Sam Kydd

Acting

Detective Sergeant in 'Q' car

Glyn Houston

Acting

Nightwatchman / Gilson

Richard Leech

Acting

Deputy Commander

Newton Blick

Acting

Chief Superintendent Jim Malcolm

Geoffrey Keen

Acting

Stone

Sydney Tafler

Acting

Creasey

Peter Burton

Acting

Slob

George Rose

Acting

Detective Inspector at Chester

Arthur Rigby

Acting

Colonel Blenkinsop

Ralph Truman

Acting

The Young Workman - Stanley James

Ian Bannen

Acting

The Young Workman's Wife - Mrs. James

Maureen Davis

Acting

Detective Inspector at Shipping Office

John Warwick

Acting

Cashier at Shipping Office

Joss Ambler

Acting

Detective Constable in Hospital Ward

Barry Keegan

Acting

House Surgeon

Alec McCowen

Acting

Secondhand Dealer

Harry Locke

Acting

Police Constable Bates

Nicholas Parsons

Acting

Newspaper Circulation Manager

Warwick Ashton

Acting

Mrs. Elliot / Mrs. Gilson

Ursula Howells

Acting

Welsh Police Constable

David Davies

Acting

Welsh Newsagent's Daughter

Julie Milton

Acting

Mr. Thomas

Meredith Edwards

Acting

Official at Somerset House

Harold Goodwin

Acting

House Agent at Shepperton

John Welsh

Acting

Housewife at Shepperton

Gillian Webb

Acting

Mrs. Stevens, the daily help

Maureen Delaney

Acting

Detective Superintendent Ogilvie

Jameson Clark

Acting

Manager of Festival Hall

William Mervyn

Acting

P.C. at Hospital (uncredited)

Vincent Ball

Acting

Detective (uncredited)

Richard Davies

Acting

Urchin (uncredited)

Frazer Hines

Acting

Constable (uncredited)

Stratford Johns

Acting

Detective at Car Lot (uncredited)

David Lodge

Acting

Detective (uncredited)

Guy Standeven

Acting

Detective tailing Creasey (uncredited)

Frederick Treves

Acting

CID Man (uncredited)

Peter Welch

Acting

Officer in Criminal Records Department (uncredited)

Martin Wyldeck

Acting

Dennis Carnell

Acting

Edward Cast

Acting

Michael Collins

Acting

Fred Davis

Acting

Jack Dearlove

Acting

Robert Gregory

Acting

Fred Griffiths

Acting

Patrick Halpin

Acting

Aidan Harrington

Acting

George Holdcroft

Acting

Lindsay Hooper

Acting

Arthur Howell

Acting

Colin McKenzie

Acting

Jack McNaughton

Acting

Robert Moor

Acting

Fred Nicholas

Acting

John Paul

Acting

Roy Purcell

Acting

Charles Rayford

Acting

Anthony Richmond

Acting

Pat Ryan

Acting

Philip Stewart

Acting

Meadows White

Acting

Detective (uncredited)

John Wilder

Acting

Sonnie Wills

Acting