Theme: Science Fiction. Phonics Skill: Prefixes. Colonists on a distant planet are told to prepare to defend against an alien invasion. But as Celeste and her friends soon realize, all is not as it may seem. Support striving readers with these low-level, age-respectful decodable books. Phonics Decodable Readers feature words from basic phonics rules, plus specific pattern words. All books feature a glossary, and nonfiction books include technical vocabulary and definitions to help set striving readers up for success. Each book is 48 pages.