In a remote island shrouded in mystery, Sherlock Holmes must solve the enigmatic Kuan-Ti's Riddle, which threatens to unravel the fabric of reality, as he delves into the dark underpinnings of the Cthulhu Mythos....

In the shadowy streets of Kuroshima, a young historian stumbles upon an ancient cult's ritual, awakening a primordial force that threatens to consume the island....