At first the fireballs seemed to be nothing more than a dazzling display of lights in the sky, plunging into the deepest oceans and disappearing without trace. But, when ships started sinking inexplicably and the sea-lanes became impassable, it seemed that the world was facing a threat of unprecedented proportions. Mike and Phyllis Watson, both radio journalists, are caught up in the centre of events, well aware that it’s not the cold war or international conflicts that are causing these e...