Central to the plot is John Jasper: in public he is a man of integrity and benevolence; in private he is an opium addict. And while seeming to smile on the engagement of his nephew, Edwin Drood, he is, in fact, consumed by jealousy, driven to terrify the boy's fiancÔee and to plot the murder of Edwin himself. As in many of Dickens's greatest novels, the gulf between appearance and reality drives the action. Set in the seemingly innocuous cathedral town of Cloisterham, the story rapidly darkens with a sense of impending evil.