Was the mysterious 30-megaton blast that flattened a Siberian forest in 1908 actually caused by a small black hole? Does matter drawn into a black hole reappear out the 'other side' as anti-matter, a sort of mirror-image of the universe as we know it? Could back holes explain the 'Big Bang'? Does their existence raise the possibility that matter can move faster than the speed of light? The noted scientist and science fiction author explores the exciting implications of black holes, taking the reader on an engaging tour from the atom's innermost core to the outermost reaches of the universe.