Rod Taylor
— Peter McDermott
Catherine Spaak
— Jeanne Rochefort
Karl Malden
— Keycase Milne
Melvyn Douglas
— Warren Trent
Merle Oberon
— The Duchess Caroline
Richard Conte
— Detective Dupere
Michael Rennie
— Geoffrey - Duke of Lanbourne
Kevin McCarthy
— Curtis O'Keefe
Carmen McRae
— Christine
Alfred Ryder
— Capt. Yolles
Roy Roberts
— Bailey
Al Checco
— Herbie Chandler
Sheila Bromley
— Mrs. Grandin
Harry Hickox
— Sam
William Lanteau
— Mason
Ken Lynch
— Joe Laswell
Clinton Sundberg
— Lawrence Morgan
Tol Avery
— Kilbrick
Davis Roberts
— Dr. Elmo Adams
George Boyce
— Bellhop
Charles Alvin Bell
— Vickery
Robert Goodwin
— Henry
Jack Donner
— Elliott (uncredited)
Lester Dorr
— Cy - Elevator Operator (uncredited)
Vince Howard
— Tousaint (uncredited)
Dorothy Konrad
— Housekeeper (uncredited)
Judy Norton
— Daughter (uncredited)
John Sebastian
— Giotti (uncredited)
William Swan
— Young Desk Clerk (uncredited)
Arthur Tovey
— Hotel Patron (uncredited)