Sapphire

Nigel Patrick

Superintendent Robert Hazard

Michael Craig

Inspector Phil Learoyd

Yvonne Mitchell

Mildred

Paul Massie

David Harris

Bernard Miles

Ted Harris

Olga Lindo

Mrs. Harris

Earl Cameron

Dr. Robbins

Gordon Heath

Paul Slade

Barbara Steele

Student (uncredited)

Peter Vaughan

Detective Whitehead (uncredited)

Yvonne Buckingham

Sapphire Robbins

Jocelyn Britton

Patsy

Robert Adams

Horace Big Cigar

Desmond Llewelyn

Police Constable

Fenella Fielding

Lingerie Shop Manageress

Susan Stranks

Student

Freda Bamford

Sgt. Cook

Rupert Davies

Ferris

Orlando Martins

Barman

Harry Baird

Johnnie Fiddle