It was just a smooth round metal ball, less than a metre in diameter. Although it was still hot from its journey through the huge nothingness of space, it looked quite harmless. But what was it, exactly? A meteor, perhaps - just one of those pieces of rock from outer space that occasionally fall down on to the planet Earth. But meteors don't usually make strange hissing sounds ...In this collection of four of his famous science-fiction stories, John Wyndham creates visions of the future that make us think carefully about the way we live now.