Sam was born on the moon. He lives on a moon base with his parents. He's never been to Earth. But there's a school break, and his aunt invites him to stay with her family. Sam is excited. He will get to spend time with his cousin, Linn. She will show him around. His parents know he will love his home planet.Hi-Lo Chapter Books for Children. This series of short novels was designed to engage a broad spectrum of struggling readers. No longer will upper-elementary students have to read material junior to their maturity and interests. Characters are age appropriate and come from diverse cultures and backgrounds. Science fiction, sports, paranormal, realistic life, historical fiction, and fantasy are just a few of the many genres. Books are no higher than a 1.5 reading level, with illustrations on every spread that support visual literacy and draw kids into the text.