In the near future, a French submarine finds itself in a crisis situation. Among the crew: Commandant GRANDCHAMP, second-in- command D’ORSI, and CHANTERAIDE, acoustic analyst and specialist in sonar detection. They extricate themselves from the crisis efficiently, though unconventionally. Yet part of the operation remains shrouded in mystery: a sound which CHANTERAIDE, the sub's “golden ear” (who can detect and classify virtually any sound thanks to a particular training), was unable to identify. Obsessed by this “unclassifiable” sound which almost jeopardized the operation, and despite his subsequent temporary suspension, CHANTERAIDE defies his superiors’ orders and decides to investigate. Amid high stake international tensions, guided by his almost poetic inspiration and intuition, CHANTERAIDE will unwittingly participate in an even more dangerous “dissuasive maneuver” that will lead his country - and the rest of the world - to the brink of apocalypse.