The World-Shakers!

Blake is contacted by Eustace Craille, the head of one of England's secret agencies and a familiar figure to fans of the New Order stories - he was Blake's chief during the Second World War. But those years have passed and the new enemy isn't from Germany or Japan or, perhaps, even from this planet. UFO sightings are on the increase and Craille is worried. Something odd is going on and he wants to know what it is.