In 1969 the Apollo moon landing is to be televised internationally but at a country fair in England a small boy named Jim meets the 90-year-old Julius Bedford who tells him that,in 1909,as a struggling writer,he met eccentric Professor Cavor,inventor of Cavorite,a gravity-defying substance which they used to build a sphere,which took them to the Moon. Captured by ant-like Selenites,Bedford was anxious to make his escape but Cavor was happy to stay and communicate with the Moon-dwellers. Back on Earth Bedford hears via wireless that Cavor was forced to kill himself and the Moon-dwellers to prevent them from invading Earth. As Jim watches the Apollo landing with his parents back in the present he sees a Selenite,hiding behind a lunar rock,peering at the astronauts.

After serving jail time for a mysterious crime, Bill and Karl get out of jail and become preoccupied with figuring out who turned them in to the police. On top of that, the "family business" is on the rocks, and the motley crew of criminals who operate out of Down Terrace aren't feeling terribly trusting of one another. It might look like an ordinary house, but at Down Terrace, the walls are closing in...