Peter Robb’s superb book Midnight in Sicily is a sensuous tour of Sicilian food, art, and urban life. Organized crime, its ostensible subject, lurks in the background — the dark alleyway behind the piazza of the setting. Yet, at least in 1996, when the book was published, Robb could mention the Mafia. For much of the 20th century, few people acknowledged that Cosa Nostra even existed. One of the exceptions was the crime novelist Leonardo Sciascia.