This is the story of a brother and sister who find themselves as accidental stowaways on a space shuttle mission to the planet Mars. The things they see and the things they find will excite the reader’s imagination. The story is in 14 chapters, written for kids aged 4 to 10. It can be read aloud to kids aged 4 to 7, or read alone by kids aged 7 to 10. There is also a 32-word glossary at the back on the book. In the story, the defined words are underlined.