On the fifth anniversary of the assassination of Imad Mughniyah, a.k.a. “The Iranian Jackal,” much new information about the hunt for the terrorist most wanted by Mossad and the FBI has emerged. It’s a story of high-tech surveillance and old-fashioned espionage, and it’s just starting to be truly told now. Imad Mughniyah was 20 years old when he made his debut on the international terrorist scene in 1983, with a series of spectacular and deadly bombings aimed at Western forces in Lebanon. The 1983 Beirut suicide bombings included those on April 18 at the U.S. Embassy (63 killed); on Oct....