Journey to the Planet Earth
Couri Vine was born with a deadly lung defect and has to wear an embarrassing helmet just so she can breathe. But when you live in a city on the moon, maybe that helmet isn't such a bad thing after all.
When her grandfather Doo Dad is taken prisoner by Moon Leader Todal, Couri embarks upon a journey to the planet Earth to find his old InData device, which she hopes will help her find him. But along the way she discovers more of her grandfather's secrets, and learns that he may not be the kind of person she thought he was.