Eight-year-old Tommy thinks his adventures are all over - it seems long ago that he travelled, by magic umbrella, to the kingdom of Barl and helped to restore it to the power of the good Queen Treen.One day, he discovers his otherworldly travels are to start again, thanks to a new friend! However, instead of journeying to one world, he is about to travel to many - past the moon and Mars, and into the outer reaches of space, to the Netherland itself.But what is the secret of his new-found friend? And will he escape the clutches of the most powerful enemy he will ever face?