Those mysterious domes on the Moon - what were they? Who built them? Thanks to young Chris Godfrey and his historic rocket-flight they had been photographed from outside the atmosphere; they had been under constant observation by the world's astronomers - but the answer was as baffling as ever. Until one day every single atomic power station on Earth suddenly and disastrously went out of action. There could only be one explanation - the extra-terrestrial radiation bombardment of appalling magnitude. And only one possible source of it: the domes of Pico.