Lieutenant of the French forces engaged in Mali, David Faber is seriously burned during the explosion of his armored vehicle. Repatriated to France for intensive care, he must begin a long convalescence, under the worried but devoted gaze of his sister Jeanne. They meet again in the family house in the Alps, between mountains, lake and forests. Jeanne tries to reconnect her brother with the past, but David, who suffers from amnesia after the accident, does not seem to be interested in reconciling with the man he used to be.

At Léon Blum High School in Créteil, France, a history teacher decides to have her weakest 10th grade class participate in a national history competition.

In the near future, Paris is divided into three zones that separate social classes, and no one can escape ALMA, a predictive AI that has revolutionized law enforcement. When ALMA’s creator is assassinated, Salia, a top agent, and Zem, a jaded cop, are forced to work together to solve a murder that may expose the dark secrets of the system they serve.