What famous actor starred in the French film "The Professional" in 1981?

"The Professional" is a 1981 French action thriller film directed by Georges Lautner. The film stars Jean-Paul Belmondo as the title role. The film is based on award-winning 1976 novel Death of a Thin-Skinned Animal by Patrick Alexander.

The music was composed by Ennio Morricone and the main theme "Chi Mai" became an instrumental hit.

In the film Jean-Paul Belmondo roles as a French secret agent Joss Baumont sent to kill the president Njala of an African country. However, a counter-order is given before he can execute his mission and he is abandoned in the hands of foreign authorities. He escapes and seeks revenge by pursuing what was his original mission.