Tom Conway

Character: Tom Conway, Private Investigator

Mila Parély

Character: Helen Pascall

Naomi Chance

Character: Gina, a model

Eric Pohlmann

Character: Mr. Mercedes

Andrew Osborn

Character: Capt. Colin Simpson

Richard Wattis

Character: Detective Inspector MacLeod

Margaret Halstan

Character: Lady Marchant

Eileen Way

Character: Mme. Fernande

Michael Ripper

Character: Eddie

Betty Cooper

Character: Miss Betty, Showroom Mistress

Thomas Heathcote

Character: Detective Sgt. Jessup

Alan Rolfe

Character: Inspector

Roger Delgado

Character: Marlowe

Reed De Rouen

Character: Heath

Delphi Lawrence

Character: Chelsea

Christine Forrest

Character: Blonde

Ann Hanslip

Character: Jane, model with shoulder-length hair

Davy Leon

Character: George

Dorothy Robson

Character: A Seamstress

Leo Phillips

Character: Harry, the Night Watchman

Robert Moore

Character: Stevenson

Denis Cowles

Character: Commissionaire

John H. Watson

Character: Chauffeur

Cleo Rose

Character: Vivian

Cab Kaye

Character: Self - Singer-Pianist (uncredited)

John Lynn

Character: Nightclub Patron (uncredited)

Jack Mandeville

Character: Fashion Show Attendee (uncredited)

Ernie Priest

Character: Policeman (uncredited)