It's a truth universally acknowledged that books are good for the soul. But for some, too much knowledge is a dangerous thing. What one person reads as vivid, poignant and moving, another sees as violent, perverse or politically dubious. Thus, book banning has existed from the beginning of time and a quick flick through any well-stocked bookshelf will reveal titles that, at one point or another, have been subject to censorship. From tomes with obvious reason for censorship (American Psycho, for example) to unlikely banned texts (Black Beauty?