Doctor X

On October 1, 2013, the U.S. government brought down Silk Road—the notorious "Amazon of drugs"—a Dark Web empire where anyone could buy illegal narcotics and pharmaceuticals with the click of a button. Its mastermind, twenty-something Ross Ulbricht, was sentenced to life in prison. So were the site's administrators, moderators, and key players. All except one: a Spanish doctor known only as Doctor...