Ruth Roman, Edmond O'Brien, Richard Jaeckel, Barry Kelley, Whit Bissell, Basil Ruysdael, Marvin Miller, Yvette Duguay, Paul Picerni, Isabel Randolph, Philip Ahn, Frances Rafferty, Frank Ferguson, James Griffith, John Alvin
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.