His name is Touraj Esmaeeli, and you haven’t heard it before. And yet, he’s a big story. He worked as a top advisor to the Iranian intelligence service, as an expert on that country’s cyberwar against the United States and other Western countries. Several of his colleagues have been arrested since last spring, accused of spying, but the spybust hasn’t been widely covered. Esmaeeli scooted off to Istanbul, where he first checked in to a hotel and then barely escaped a combination of Iranian and Turkish agents who had come to arrest him. He has taken refuge in a Western...