Lin Yu is the heart and soul of the Binhai City Criminal Investigation Brigade. Thanks to his deep understanding of criminal psychology and keen powers of observation, he has solved one bizarre case after another. Facing this difficult series of murders, he knows the killer is no ordinary criminal, and that every detail could hold the key to solving the mystery. Su Yao, the team's forensic pathologist, misses no clue during autopsies, relying on her superb skills and conscientious approach to provide crucial leads for the investigation. Then there is the technical officer, whose exceptional networking skills and data analysis abilities help sift through a sea of information in search of the killer's trail in the digital world. This is a battle between justice and evil, a contest of intelligence and courage. How will Lin Yu, Su Yao, and the technical officer fight to the death against evil amid the layers of fog?