The gripping account of the out-of-control drug wars that have brought chaos to Mexico. This is the story of the ultraviolent criminal organisations that have turned huge areas of Mexico into a combat zone. It is a piercing portrait of a drug trade that turns ordinary men into mass murderers, as well as a diagnosis of what drives the cartels and what gives them such power. Veteran Mexico correspondent Ioan Grillo traces the gangs from their origins as smugglers to their present status as criminal empires. The narco cartels are a threat to the Mexican government - and their violence has now reached as far as North Carolina.