Robert Motherwell’s review published on Letterboxd:
Bracingly tense from the first scene yet full of a meditative and even melancholy spirit.
Tingling thriller about a contract killer living by a personal code similar to that of a samurai is bolstered greatly by Alain Delon's ferociously focused performance.
Seems to take its que from older gangster films like White Heat or Scarface but this certainly stands on its own-especially from other French directors at the time.
Definitely influential over all lone gun men thrillers such as John Woo's The Killer or Hard Boiled-but while the film may have been imitated many times rarely has such deep feeling been expressed by the lead actor or the direction.