"To be young, good-looking, healthy, famous, comparatively rich and happy is surely going against nature." When Joe Orton (1933-1967) wrote those words in his diary in May 1967, he was being hailed as the greatest comic playwright since Oscar Wilde for his darkly hilarious Entertaining Mr. Sloane and the farce hit Loot, and was completing What the Butler Saw; but less than three months later, his longtime companion, Kenneth Halliwell, smashed in Orton's skull with a hammer before killing himself. The Orton Diaries, written during his last eight months,...