As soon as the idea of strategic bombing was conceived, men began to look at ways of detecting them – or at evading this detection. Today’s stealth technology as exemplified in the Lockheed Martin F-117A Nighthawk seems to have won a race which began in the 1930s with the possibility of developing a death ray! The radar weapons race hotted up when the British showed how vital it was in the Battle of Britain. This programme looks at developments ever since, with ever-more extraordinary ways of spotting all sorts of military and civil machines or of evading detection.