Despite multibillion-dollar investments in cybersecurity, one of its root problems has been largely ignored: who are the people who write malicious code? Underworld investigator Misha Glenny profiles several convicted coders from around the world and reaches a startling conclusion.

Journalist Misha Glenny spent several years in a courageous investigation of organized crime networks, which have grown to an estimated 15% of the global economy. From the Russian mafia to the giant drug cartels, his sources include not just intelligence and law enforcement officials but criminal insiders.