Stan, a director who, following a failed first film, had put an end to his career. During an appointment with his doctor, he learns that he only has 3 months left to live.

Paul Château-Têtard, a 45-year-old bachelor from the best of Parisian nobility, has – for the first time in his life – to take the Metro, and even buy a ticket. It is with extraordinary luck that the beautiful young Ava happens to be sitting at the counter: a spark ignites and wedding bells begin ringing in the distance.

Freshly hired as a labor nurse in a chemical factory, Nour discovers that small arrangements exist between management and her father, Slimane, the staff representative, and the company's pivot. Lies about polluting discharges, hidden illnesses of employees, hidden accidents ... Nour, little by little, no longer accepts the compromises of his father to preserve the image of the company. She decides to launch the alert.