Book excerpt: Rockets, space travel and the man-in-the-moon combine in this marvelous flight of fancy. Finn is fascinated by the idea of space travel. He longs to fly to the moon in a rocket to meet the man-in-the-moon face to face. So he goes to New York to meet the famous rocket scientist, Dr Gass, in the hope that he will realize his dream. But Dr Gass tells him the moon is made of rock, not cheese, and that there is definitely no man-in-the-moon. Finn is bitterly disappointed until he meets the Night Thing, who invites him to the man-in-the-moon's birthday party. Could Dr Gass be wrong after all? And how will he get there? In a rocket, of course, and the rocket is on the roof.