I was only a year old when the UK's deadliest terror attack shocked the world. In December 1988, Pan Am flight 103 exploded over the Scottish town of Lockerbie, killing all 259 people on board as well as 11 on the ground. I was a teenager by the time Libyan intelligence officer Abdelbaset al-Megrahi was convicted of the bombing in 2001 and, when he later died, I thought that was largely the end of the story. It wasn't. The case still rumbles on and, later this year, a man suspected of making the bomb which blew up the plane, Abu...