A rookie police officer named Luo Fei discovers an extraordinary gene fusion system that grants him the superhuman abilities of animals—from a dog's acute sense of smell to other beast-like powers. While assisting a woman in locating her missing cat, Luo Fei's enhanced olfactory abilities detect a horrifying odor emanating from a neighboring balcony. The putrid reek of decomposing flesh signals the beginning of a dark mystery that will thrust him into a nightmare of crime and horror.