The rifle was forced through the window of my old Renault Four car and rammed up my nose, forcing my head back at a painful angle. Here I was: a youngish retail executive, outside the rebel-held Airforce Base of Debre Zeit, deep in the heart of Ethiopia, while two rebels argued about killing me. It is at times like this that one wonders how the hell one got into such a situation. Derek Lupson didn't ask for a life of adventure. In 1973, he was running...