In the SHERLOCK episode "The Reichenbach Fall," Sherlock and John Watson ran into James (Jim) Moriarty in the home of a journalist determined to expose Sherlock as a fraud. Sherlock was furious and Moriarty acted cowardly and very un-James-Moriarty-like. He claimed to be an actor named Richard Brook whom Sherlock had hired to act as a nemesis in his adventures to bolster the public opinion/image of Sherlock. "Richard" claimed there was no Moriarty.
Is Richard really James, or is James really Richard? Did Sherlock actually pay an actor to be Moriarty? Is there a real Moriarty?