Le Voyou, also known as The Crook, is a highly stylized French action movie which follows Simon the Swiss during his largest heist. Directed by Claude Lelouch in 1970, and starring JeanLouis Trintignant, the movie makes use of several cinematic techniques to convey the elusive nature of the title character, among them are a circular narrative, dialogue littered with conflicting statements, flashbacks, musical montage, multiple styles of film editing, misaligned sound editing, and a movie within the movie.
Source: Wikipedia