Department S

A man is assassinated on board a plane in the middle of a flight - or so it seems until the assassin jumps from the 'plane' onto the floor of a warehouse. Although some other 'passengers' pursue him and shoot at him, he escapes. Alarmed by the shots, the French police turn up and find the warehouse and the 'plane' set abandoned, except for the body of the dead man. The Department is assigned to find out what happened and why anyone would go to the trouble of constructing a full scale set just to shoot a man.

The agents start investigating, and the first clue comes in the form of a message scrawled in lipstick on the windshield of Stewart's car. Yet the girl who wrote it is murdered before Stewart and Jason can get to her. However, another lipstick-message she left leads them to a gambler and gangster named 'Lucky' LeBeau. Annabelle goes undercover as a tourist to make his acquaintance - a gamble that has Stewart concerned about her safety...