The story takes place in the bustling metropolis of Paris. The successive murders of illegal immigrants have plunged the entire city into panic. The horror of the deaths of these victims and the cruel methods of the murderers are all unheard of and unseen by the detective Paul (Jocelyn Quivrin) in charge of the case. In order to solve this difficult case, Paul found the experienced police officer Schiffer (Jean Reno). With his help, can Paul bring the real murderer to justice? On the other side, a young woman named Anna (Arly Jover) finds that she has suddenly lost her memory, and everything around her has become strange and terrible one day. Anna keeps struggling and exploring, hoping to solve the mystery of her life experience. As time goes by, Anna finds that she seems to be caught in a conspiracy.