Alex improves his Star Jumper and it is bigger and better than ever. But he knows he still has a few more inventions to make to ensure success as he goes into space, hopefully with Zoe as his co-pilot. He needs an anti-gravity belt so the gravity differences between planets can be handled by his body. He also needs a way to restrict Jonathan's spying and getting in the way.
I love this series. Alex's asides and explanations as he tells the story have me laughing out loud. He is a riot. The drawings that illustrate what he means are great. Alex and Jonathan are so realistic. I cannot wait to read book 3. This is so much fun!