A director, producer and assistant take the Trans-Europ-Express from Paris to Antwerp, where they brainstorm ideas for a film about a greenhorn drug smuggler and a kinky prostitute.

A film director, Jean, his producer, Marc, and his assistant, Lucette, board the Trans-Europ-Express in Paris bound for Antwerp. Once in their compartment it occurs to them that the drama of life aboard the train presents possibilities for a film, and they begin to write a script about dope smuggling.—Anonymous