Iris, a choreographer and hip-hop dancer, has just witnessed the kidnapping of her sister Violette! Since the young woman has a serious heart condition, every second counts in the search for clues to locate her. While Chris sets out on the trail of a rivalry between sisters, Charlie and Samy immerse themselves in rehearsals for the next video clip choreographed by Iris, at the Musée des Arts in Nantes. What if these two leads ended up coming together?

Samy returns to medical school: one of his former professors and a student have been found dead in a room in the university residence. The future coroner finds a place that is dear to him and where he spent a lot of time. With Charlie Holmes, they embark on an investigation that promises to be more complicated than he thought. What was the real relationship between this professor and her student? Who was targeted, the student or the professor, or both? More than ever, the duo must blend in with the crowd to unmask the culprit.