The book might lack the locker-room snooping and legwork that made Gomorrah such a visceral masterwork but it remains a tremendously gripping work of reportage. Throughout, Saviano turns an appalled eye on the methods used to grow, stock, transport and protect shipments of angel dust. “In order to understand cocaine,” he writes, “you have to understand Mexico.” Some 90 per cent of the cocaine currently used by Americans is thought to come across the US-Mexican border. Run by computer-literate entrepreneurs, the frontier cartels have spread their tentacles as far afield as oil-rich Houston. Corrupt Mexican policemen are mixed up in the transborder drug killings which, says Saviano, have become increasingly “lurid”. (Bodies are no longer quietly dumped in the desert; they are displayed for all to see, and in some cases decapitated or flayed.)