Trap for the Assassin was based on
Roger la Honte, one of the most popular
feuilletons by
Jules Mary. The script for the film was adapted by
Jean-Louis Bory, who was an admirer of Freda's work, having met him in 1962 in Paris. Bory claimed that he wrote the adaptation and dialogue exclusive to function with Freda's direction. According to Freda and his assistant director
Yves Boisset,
Trapped for the Assassin was a project Freda really cared about. Shooting for the film took four weeks and used three cameras at once. ==Release==