Antoine Cerda, a senior police officer with the prestigious Investigation and Intervention Brigade, who is transferred to the Anti-Crime Brigade after being sanctioned by the General Inspectorate of the French National Police. The move sees him turn his back on his former comrades and unit, led by the charismatic Sami Belkaïm. When two officers from his old squad are killed in less than 24 hours and a third goes missing in mysterious circumstances, Cerda embarks on his own investigation. His inquiries will reveal an intense police rivalry and take him on a terrible downward spiral.