Well over one million copies ofThe Lost Symbolwere sold on its first day on the shelves. It looks set to followThe Da Vinci CodeandAngels and Demonsas a great money-spinner for Dan Brown.So what makes this a hit? Would it be the cliched characters (a deranged baddie, who is ‘pulled onwards by destiny’s gravity’, a brainy hero and a scientist sidekick)? Or perhaps the wearisomely breathless plot which speeds from one grand location to another? Maybe it’s the obvious or patently silly twists in the story? I suppose it could be the paragraphs of dubious facts dumped awkwardly into dialogue.