Narcotics officer Lulu (Didier Bezace) and his squad doggedly navigate the grimy underbelly of Paris, contending with red-tape, a lack of resources and an overwhelming in-tray. Co-written with a French police veteran, Michel Alexandre, Tavernier’s film avoids the clichés, delivering an authentic and gritty glimpse into the everyday realities and Herculean challenges of an urban narcotics squad.