Professor James Moriarty stands alone as the particular nemesis of Sherlock Holmes. But just how evil was he? Here are four stories, all exploring an alternate possibility: that Moriarty wasn't really a villain at all. But why, then, did Holmes describe Moriarty as 'the greatest schemer of all time', and 'the Napoleon of crime'? Holmes could never catch Moriarty in any of his imagined schemes - which only reinforced his conviction that the professor was, indeed, an evil genius.