The head of one of the world's deadliest drug cartels sits in a Mexican prison. The government trumpets his capture as a major blow to the drug trade in the country. And then one day, the king of the narcos simply walks out of prison, and back into the drug trade. Yes, we're talking about Joaquin "El Chapo" Guzman, but this is also how novelist Don Winslow's latest crime epic The Cartel begins: with the fictional, government-sanctioned prison break of a cartel kingpin.