Lin Yan, the Binhai City forensic doctor, is a well-known "crazy critic" in the police station - when others perform an autopsy to see the fatal injuries, he stares at the invisible blue symbol next to the body and says it is "the whisper of the god Cthulhu." Because of this "crazy talk", he was thrown into the cold case department, until a mirror suicide case broke out: the mirror of the deceased's bathroom was covered with twisted symbols. As soon as his fingertips touched it, tentacle shadows exploded in front of his eyes, and he was shocked to realize that there was a supernatural conspiracy hidden in the case.
From the victims who disappeared out of thin air in the Shenyin case, to the symbolic black mist pouring out of the abyss of the subway, from the faceless man who demanded his life in the hospital, to the sacrificial ceremony on campus, he solved the series of mysteries by interpreting symbols, while slapping his boss Zhang Cheng in the face for questioning him, while pulling together detective Chen Mo and assistant Su Xiao, who believed in him, to form a team to investigate the case. But the more he investigated, the more alarmed he became: he was actually a "pure-blooded descendant of the Keeper of Secrets", and the symbol was the key to opening the seal of the Lord of the Deep Sea. His father's "accidental death" ten years ago had long been tied to the conspiracy of the symbol.
When the sacrificial sect mobilizes the whole city to awaken the gods, he must gamble his life between "using forbidden power to save the world" and "becoming a vessel for the gods" - can he break this death game set by the gods with the symbols?
