At just 18 years old, Kevin Lorin has become a high-flying scammer, a potential Arsène Lupine. While the police intervene in one of his scams on the Basque coast, he gives up on fleeing and surrenders to everyone's surprise. This early retirement will take an unexpected turn when the commissioner recruits him for a very special infiltration into a homicide case. Following this "fun" experience, he will have only one idea in mind: to become a cop!