Define character of mr moriority.

Every great fictional hero has an equally great nemesis. Sherlock Holmes is no exception. One of the most infamous characters in literature, Moriarty ironically appears in only two Sherlock Holmes stories. Indeed, he does not ever actually appear in The Valley of Fear: he is only referenced, and, at the end of the book, Holmes receives a short note from him. Nonetheless, Moriarty remains one of the central characters of this novel, and he is revealed to be the mastermind behind Douglas’ demise.