Elias, a former occult assistant at Miskatonic University, was forced to regain his banned investigation notes due to the mysterious disappearance of his mentor and a strange tentacle-like deformation on his body. Following the clues in the remaining pages of "The Secret of the Worm", he went deep into the town of Youtide, which was shrouded in thick fog all year round and full of rumors of deep diver hybrids. His sanity was constantly being questioned. In the process of being corroded by whispers, being besieged by cultists, and being pursued by supernatural aberrations, they connect the missing cases of the small town, the remains of ancient god sacrifices, and the hidden family secrets of the mentor, solve the nested strange puzzles, and reveal the conspiracy of the "Song Society" to try to awaken the old rulers through flesh and blood rituals, using wisdom and ancestral mysteries. Fight against the terror of chaos, break the shackles of the traditional restraint system's "human beings are insignificant and powerless", unlock new clues and confrontational capabilities in every close-to-death investigation, and finally stop the god's descending ritual, uncover the inner ghost hidden in the investigation team, achieve logical closed loops and righteous counterattacks under the oppression of unknown fear, and let the suspenseful mystery of the restraint system The sense of strangeness is deeply integrated with the exhilaration of reasoning and solving puzzles, and the thrill of fighting against a desperate situation. Every splicing of clues, every time the plot of a cult is revealed, every time a head-on confrontation with an aberrant creature brings a strong sense of relief and accomplishment. At the same time, it retains the lingering fear of the unknown unique to the genre, satisfying the dual expectations of fans of suspense reasoning and weirdness.