Book excerpt: A brand-new Sherlock Holmes mystery from acclaimed Sherlockian author David Stuart Davies, featuring the return of the sinister Moriarty gang... When Professor James Moriarty plunged over the Reichenbach Falls the world believed that Sherlock Holmes was also dead. Three years later, Holmes has returned – but so, too, has a deadly threat. With Moriarty’s criminal empire still very much alive, Holmes and Watson are forced to ask themselves if their greatest foe really did perish…