Frank and Lucie's investigation of Jean Lanvin's death makes progress. One lead takes them to Le Chéri, the swingers club in the city where everyone is dressed. The two policemen infiltrate the establishment and they discover in the middle of the party-goers a way which could bring them up to the rebels.

• Judith Godinot
• Olivier Fox
• Olivier de Plas

• Valérie Decobert-Koretzky
• Alain Bouzigues
• Malya Roman