Clouzot's health problems kept him from military Service. In 1939, he met actor Pierre Fresnay, who was already an established film star in France. Clouzot wrote the script for Fresnay's only directorial feature Le Duel, as well as two plays for him: On prend les mêmes, which was performed in December 1940, and Comédie en trois actes, which was performed in 1942. Despite writing scripts for films and plays, Clouzot was so poor that he resorted to trying to sell lyrics to French singer Édith Piaf, who declined to purchase them. After France was invaded by Germany and subsequently during the German occupation of France during World War II, the German-operated film production company Continental Films was established in France in October 1940. Alfred Grevin, the Director of Continental, knew Clouzot from Berlin and offered him work to adapt stories of Writer Stanislas-André Steeman. Clouzot felt uncomfortable working for the Germans, but was in desperate need of money and could not refuse Grevin's offer. Clouzot's first film for Continental was the adaptation of Steeman's mystery novel Six hommes mort (Six Dead Men). Clouzot retitled the film Le Dernier des six, having been influenced by Actress Suzy Delair while writing the script, allowing her to choose the name of the character she would play.