From Earth to Venus and back to Earth again goes Bruce Robinson after his father has been made public relations man of Tycho City on the moon. One result of the journey is the discovery of a bacteria killing mould. Other features are the discovery of an enigmatic scientist marooned on Venus some years before- the dangers of the Venusian batmen and their burning ultra-sonic waves- infra-red plants as the main source of oxygen. There are important human elements here too- the maturing of Bruce; the question of emotions in the batmen and the mysterious scientist's relationship with them. This is written in a flip, tangy manner that seems to complement the fantasies which are described, and the scientific basis for the writer's imagination is discussed in an enlightening last chapter.