"The weakest of the Tintin books I have read. Calculus is building a nuclear powered rocket at a research site in Syldavia. He wants to go to the moon and he invites his old friends Tintin and Haddock to go along with him. Unfortunately, there is a spy inside the research centre who is sending the secrets of the rocket to some foriegn power. However, this will not stop our intrepid explorers."