A courageous judge tries to dismantle a drug traffickers ring.

The relationship between a middle-aged French widow (Simone Signoret) and a young drifter (Alain Delon) takes a turn when her young niece pays a visit.

Police commander Simon Weiss, head of the division that supervises Paris’s demi-monde, starts out on his nightly tour of bars, discos and strip clubs, making sure once again that the…