I like to think I’m open minded when it comes to buying books, but there’s one type I always try to stay away from, the type of book that I even have a rule for: If you love the movie, stay far far away from the book it was based on. This rule wasn’t born overnight – it is the product of a long, sad history of reading the source material of my favourite movies. Apollo 13, The Jungle Books and even my beloved Lord of the Rings – they all followed one of two treacherous patterns. The movie was…