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After emerging from Shadwell's underground cave, Holmes and Watson are once again involved in strange cases! In 1895, Bethlem Royal Hospital admitted a patient with mutilated limbs. He kept carving three lines of R'lyeh in the ward, and then disappeared mysteriously. Clues are increasingly pointing to an expedition that took place on the Miskatonic River many years ago, and the goal of that expedition was Shoggoth.

Watson's secret manuscript has been rediscovered, and there is another hidden secret in the Sherlock Holmes story! In London in 1880, the bizarre murder case recorded by Watson in "A Study in Scarlet" came to an end, but an evil ritual to summon the ancient gods of the universe has officially begun. Sherlock Holmes, the incarnation of wisdom, will face a horrifying truth beyond the scope of human cognition. "Holmes, my dear companion, it is time that I told you what you really did." - Watson.

Sherlock Holmes, the famous detective of the 19th century, will usher in his final glory in the new era. In 1910, major members of the "Dagon Club" were murdered one after another, including Holmes's brother Mycroft, whose bodies were beyond recognition. Holmes and Watson follow clues that ultimately lead to an evil legend - the Sussex Sea Devil. Not only that, the entire world is moving towards the inevitable catastrophic battle between the ancient gods and the outer gods.

Watson's secret manuscript has been rediscovered, and there is another hidden secret in the Sherlock Holmes story! In London in 1880, the bizarre murder case recorded by Watson in "A Study in Scarlet" came to an end, but an evil ritual to summon the ancient gods of the universe has officially begun. Sherlock Holmes, the incarnation of wisdom, will face a horrifying truth beyond the scope of human cognition. "Holmes, my dear fellow, it is time that I told you what you really did." - Watson