La Disparition, a lipogrammatic classic, turns 50 today. You probably know who it’s by; if not, you can look it up to find out why I’m unwilling to say who did it. From its first publication on 29 March 1969, this book built a cult following. It’s primarily famous for what’s missing from it, a basic but important thing that forms a part of words you can’t usually do without. Staying strictly within this tight constraint, it says what it wants to say about its protagonist, Anton Voyl, and his vanishing act – a conundrum for his companions – in a grippingly ludic, rigidly formulaic way.