Based on the attacks of November 13, 2015 in Paris
In January 2015, Abdelhamid Abaaoud manages to escape an international police operation in Athens where Fred (Jean Dujardin), commissioner of the French anti-terrorist sub-directorate is present. Ten months later, on November 13, 2015, attacks hit the Ile-de-France and kill 130 people. From then on, the anti-terrorism department will conduct the investigation to find the terrorists on the run. Thanks to wiretaps, shadowing and witnesses, they will investigate relentlessly for five days, between Paris and its suburbs, Brussels and Morocco, until the police operation on November 18, 2015 in Saint-Denis. Héloïse (Sandrine Kiberlain) and Martin (Cédric Kahn) are in charge of the intelligence service. Inès (Anaïs Demoustier) and Marco (Jérémie Renier) are attentive to the setting up of the wiretaps.