While Lucie discovers the scale of the manipulations of the municipality, orchestrated by Simoni and Eva, Frank is appointed police chief by Simoni promising to "collaborate" with him.
Lucie is willing to infiltrate the rebels' camp pretending to be a dissenter who wants to join their cause. She finally discovers that they aren't dangerous terrorists but rather nice protesters who are very poorly organized.
Finding himself as an investigator, more in line with his skills, Frank tries to advance the Lanvin case on several tracks. However his daily life in the world of nudity and transparency is difficult.
Frank returns to the police but is now reduced to secretarial duties under the orders of Lucie who has risen in rank. He takes his return very badly as his colleagues don't stop making fun of him.
In 2026, a radical change requires everyone to live naked in a pacified and peaceful France. But the murder of a young woman found dressed revives tensions. The investigation is entrusted to a young inspector who collaborates with her ex-partner, just out of the coma in which he had fallen at the time ... where everyone was still wearing clothes.