Tom Conway as Tom Conway, Private Investigator

Mila Parély as Helen Pascall

Naomi Chance as Gina, a model

Eric Pohlmann as Mr. Mercedes

Andrew Osborn as Capt. Colin Simpson

Richard Wattis as Detective Inspector MacLeod

Margaret Halstan as Lady Marchant

Eileen Way as Mme. Fernande

Michael Ripper as Eddie

Betty Cooper as Miss Betty, Showroom Mistress

Thomas Heathcote as Detective Sgt. Jessup

Alan Rolfe as Inspector

Roger Delgado as Marlowe

Reed De Rouen as Heath

Delphi Lawrence as Chelsea

Christine Forrest as Blonde

Ann Hanslip as Jane, model with shoulder-length hair

Davy Leon as George

Dorothy Robson as A Seamstress

Leo Phillips as Harry, the Night Watchman

Robert Moore as Stevenson

Denis Cowles as Commissionaire

John H. Watson as Chauffeur

Cleo Rose as Vivian

Cab Kaye as Self - Singer-Pianist (uncredited)

John Lynn as Nightclub Patron (uncredited)

Jack Mandeville as Fashion Show Attendee (uncredited)

Ernie Priest as Policeman (uncredited)