Themes: well known spies throughout history, nonfiction, tween. Spies are skilled at getting secrets. Some people spy to help their country. Others do it to make money for themselves. Most spies stay hidden, but some become famous for their actions. Red Rhino Books Nonfiction is the first Hi-Lo children's nonfiction series at a first-grade reading level for students in grades 4–7. Visually appealing fullcolor photographs and illustrations—along with fun fact boxes—keep these books flowing. Also includes prereading comprehension questions along with a 20-word glossary for further reading support.