An experienced airline pilot, Estelle leads a perfect life between long-haul flights with her loving, protective husband Guillaume. One day, by chance, in an airport corridor, she crosses paths with Ana, a photographer with whom she had a passionate affair twenty years earlier. Little does Estelle know that this reunion will send her into a nightmarish spiral, turning her life upside down and irrational.
In November 2015, a series of unprecedented and deadly attacks hits Paris. The anti-terrorist police led by Heloise and her chief commander Fred - face an unprecedented level of pressure: in a race against the clock, they must find the perpetrators of the attacks as quickly as possible before they can strike again, travelling across Europe and beyond in one of the biggest manhunts in history.
Mathieu is a young and talented black box analyst on a mission to solve the reason behind the deadly crash of a brand new aircraft. Yet, when the case is closed by authorities, Mathieu cannot help but sense there is something wrong with the evidence. As he listens to the tracks again, he starts detecting some seriously disturbing details. Could the tape have been modified? Going against his boss' orders, Mathieu begins his own rogue investigation - an obsessional and dangerous quest for truth that will quickly threaten far more than his career...