When Singapore surrendered to the Japanese in 1942, the Allied POWs, mostly British but including a few Americans, were incarcerated in Changi prison. Among the American prisoners is Cpl. King, a wheeler-dealer who has managed to establish a pretty good life for himself in the camp. King soon forms a friendship with an upper-class British officer who is fascinated with King's enthusiastic approach to life.

Industrialist François Delambre is called late at night by his sister-in-law, Helene Delambre, who tells him that she has just killed her husband, André. Reluctant at first, she eventually explains to the police that André invented a matter transportation apparatus and, while experimenting on himself, a fly entered the chamber during the matter transference.