"Shanghai, China. The last expatriate Westerners still living in the city are imprisoned in a hotel by the communist authorities in order to find the spy hiding among them."
Ruth Roman
as Rita King
Edmond O'Brien
as Daniel Maynard
Richard Jaeckel
as 'Knuckles' Greer
Barry Kelley
as Ricki Dolmine
Whit Bissell
as Paul Grant
Basil Ruysdael
as Rev. Hollingsworth
Marvin Miller
as Colonel Zorek
Yvette Duguay
as Leah De Verno
Paul Picerni
as Emilio De Verno
Isabel Randolph
as Mrs. Merryweather
Philip Ahn
as Major Ling Wu
Frances Rafferty
as Mrs. Warren
Frank Ferguson
as Mr. Haljerson
James Griffith
as Carl Hoyt
John Alvin
as John Warren
Frank Puglia
as Mr. Chang
Victor Sen Yung
as Sun Lee
Janine Perreau
as Penny Warren
Richard Loo
as Officer
Donald Curtis
as Leader (uncredited)
James Hong
as Driver (uncredited)
Beal Wong
as Vendor (uncredited)
Joseph Kim
as Police Officer (uncredited)
Weaver Levy
as Sampan Captain (uncredited)
Richard Wang
as Policeman (uncredited)
Tommy Lee
Eddie Lee
Frank Lloyd
Director
Seton I. Miller
Screenplay
Lester Yard
Novel
Steve Fisher
William Beaudine Jr.
Assistant Director
Tony Martinelli
Editor
Jack A. Marta
Director of Photography
Theodore Lydecker
Special Effects
Adele Palmer
Costume Designer
R. Dale Butts
Original Music Composer
William Flannery
Art Direction
Herbert J. Yates
Producer
Peggy Gray
Hairstylist
Edward G. Boyle
Set Decoration
Howard Wilson
Sound
Bob Mark
Makeup Supervisor
Associate Producer
Earl Crain Sr.
John McCarthy Jr.
Howard Lydecker