Ritualistic murders are occurring one after another in Shenjiang City. An influencer is judged to death by comments during a livestream. A financial fraudster is locked inside his own vault and starves to death. An associate professor is turned into a living sculpture in an abandoned studio.
At every crime scene, a line of blood is left behind, corresponding to one of the ancient cardinal sins.
While hunting the killer, Deputy Homicide Chief Lu Ci discovers that the serial murderer knows his every move and is secretly connected to his sister's death. Su Mian, a criminal psychologist sent by the provincial police department, reads a chilling truth from the crime scenes: there may be more than one killer.
Even more unsettling, every victim in the cases had once crossed paths with someone using the codename “L.” The last email from this “L” lies quietly in Lu Ci's inbox. It contains just one sentence:
