A young man has the rare gift of recognizing every sound he hears. On board of a French nuclear submarine, everything depends on him, the Golden Ear. Reputedly infallible, he makes a mistake that puts the crew in mortal danger. He wants to regain the trust of his comrades, but his quest leads them into an even more dramatic situation. In the world of nuclear deterrence and disinformation, they all find themselves trapped in an uncontrollable spiral.