Chris Parsons is happily engrossed in studying post-graduate physics at Cambridge, when one day he finds an old book, sitting on a dusty shelf in an ageing professor's library. Written in a language nobody can read and made of a paper that can't be torn, this is no ordinary book. And when it enters his life, everything changes for young Chris Parsons. Soon finding himself aboard an invisible space-ship, chased by monsters made of molten rock; aboard an alien prison on a distant planet and attacked by a horde of mind-control zombies. Chris also meets a strange man with a very long scarf who claims he can travel through time and space... in a police box. It's going to be a busy day for Chris Parsons.