[Machine Translation] An undercover police officer pursuing a series of bizarre murders and a woman with amnesia who is being hunted by an organized crime syndicate meet in the 10th arrondissement of Paris, where the most terrifying "taboo" is broken. In the 10th arrondissement of Paris, another woman is found brutally murdered in the sewers of the Turkish Quarter. The body's face has been brutally mutilated, and the Paris Police Homicide Unit suspects the same murderer due to the distinctive manner in which he killed the woman. Paul ( Joslan Kivlan ), a young and hot-blooded detective who has taken over the case, is determined to solve the case and asks for help from a notorious undercover agent, Siffer ( Jean Reno ), who is well versed in the underworld of the Turkish neighborhood. Paul is strongly opposed to his aggressive investigative methods, but the two gradually get closer to the heart of the case. Anna ( Arlie Jover ), a woman with amnesia who is being chased by the police, comes to the forefront of their investigation. Anna realizes that the reason she is being chased by the police is because of her "lost" memory. At the same time, her "lost" memory is the only key to get to the bottom of what Cifere and Paul are chasing! As her memory begins to return, the shadow of the Gray Wolf, a Turkish militant group that France is not afraid to speak of, comes to the surface...