Nigel Patrick

Character: Superintendent Robert Hazard

Michael Craig

Character: Inspector Phil Learoyd

Yvonne Mitchell

Character: Mildred

Paul Massie

Character: David Harris

Bernard Miles

Character: Ted Harris

Olga Lindo

Character: Mrs. Harris

Earl Cameron

Character: Dr. Robbins

Gordon Heath

Character: Paul Slade

Barbara Steele

Character: Student

Peter Vaughan

Character: Detective Whitehead (uncredited)

Yvonne Buckingham

Character: Sapphire Robbins

Jocelyn Britton

Character: Patsy

Robert Adams

Character: Horace Big Cigar

Desmond Llewelyn

Character: Police Constable

Fenella Fielding

Character: Lingerie Shop Manageress

Susan Stranks

Character: Student

Freda Bamford

Character: Sgt. Cook

Rupert Davies

Character: Ferris

Orlando Martins

Character: Barman

Harry Baird

Character: Johnnie Fiddle

Grace Arnold

Character: Sapphire's Landlady

Thomas Baptiste

Character: Man on the Street

Victor Brooks

Character: Police Sgt.

Basil Dignam

Character: Doctor Burgess

Dorothy Gordon

Character: Lily

Nora Gordon

Character: Newsagent's Wife

Lucy Griffiths

Character: Johnnie Fiddle's Landlady

Vanda Hudson

Character: Girl at Tulip Club

Dan Jackson

Character: Nightclub Owner

Philip Lowrie

Character: Student

Bartlett Mullins

Character: Newsagent

Philip Ray

Character: Mr. Young

Lloyd Reckord

Character: Pianist in International Club

John Richardson

Character: Student

Richard Vernon

Character: Doctor at Crime Scene

Christopher Witty

Character: Boy

Dolores Mantez

Character: Student (International Club)

Anthony Singleton

Character: Bit Part

Geremy Phillips

Character: Youth

Joan Hooley

Character: Woman in Street

Boscoe Holder

Character: Dancer in Nightclub

George Curtis

Character: Police Constable