Le Doulos (1962)
Enigmatic gangster Silien may or may not be responsible for informing on Faugel, who was just released from prison and is already involved in what should be a simple heist. By the end of this brutal, twisting, and multilayered policier, who will be left to trust? jazz singer or musician, betrayal, weasel, french noir, betrayal by friend, belmondo, betrayed by a friend
ETC.
