Internet trolls and literary villains have more in common than you think, says Griselda Heppel

Let me ask you something: who do you think is the most terrifying villain in literature? Mask of Him Who Must Not Be Named Plenty of candidates to choose from. Voldemort in Harry Potter , Sauron in The Lord of the Rings , the White Witch in The Lion, the Witch and the Wardrobe , Flashman in Tom Brown’s Schooldays , Moriarty in the Sherlock Holmes stories; or going back further in the canon, Macbeth, Iago, Edmund, Richard III (as depicted by Shakespeare, I hasten to add, before any Ricardians take me apart), Mephistopheles… These are all splendidly evil figures. But not, to my mind, the most terrifying, for one big reason: we know what they are. The reader is in no doubt, from the word go, that each one of these is a Bad Lot, and how the hero will or won’t overcome them becomes the central drama of the story. (In Macbeth’s case you could say it centres on whether the hero’s better self will overcome his dark side.) No. Far more frightening, for m...