The Adventure of the Coal-Tar Derivative: The Exploits of Sherlock Holmes and Dr. John H. Watson against the Moriarties during the Great HiatusPaperback, 3 November 2021

Holmes and Watson's exploits during the Great Hiatus are revealed in a series of short stories and novellas. These adventures include how they separately helped stop the Moriarities from starting a world war and using a legendary stone to destroy London. Also revealed are the facts behind the Giant Rat of Sumatra and Holmes's encounter with Jack the Ripper.