Gréco and Max investigate in a cosmetic surgery clinic where jet-setters from all over the world have surgery, in the greatest of secrecy. A young surgeon was assassinated, then it was the big boss's turn to be shot. What hides the luxurious clinic of Doctor Rivière? Rose is very embarrassed because her own mother, the wealthy Barbara Bellecour, finds herself on the list of suspects. Barbara was indeed not only the faithful patient but one of the mistresses of Doctor Rivière...

Superintendent Gréco and Inspector Max Beretta are drawn into a sulphurous place, a magnificent castle transformed into an ultra-select nightclub, where Madame Maude brings together for the pleasure of her wealthy clients young students who are not shy. . But the French secret services have already taken over the premises for a secret operation, and Greco's team will have no choice but to investigate incognito. Rose, always there and ready to help, disguises herself as a call-girl while Beretta takes on that of a client, which causes many misunderstandings...