A continuation of the young Sherlock’s story, this is the first case Holmes and Watson undertake as a duo and focuses on how the two would be forever bonded the horror they encounter. Together they will investigate and try to thwart a nefarious cult that worships the ancient Eldritch God Cthulhu. The horrific events that Holmes and Watson encounter here lay the foundation for the iconic pair's unbreakable bond, but also explain how Sherlock became such a damaged and flawed genius.