Chapter books are important. Their target audience is kids between about ages 6 and 10, and they play a major role in developing young readers. Author Leilani Mueller knows all about writing for this age group. She's the author of a brand-new chapter book called All Aboard the Grandparents Express. The book explores grief, loss, and imagination from the perspective of its 8-year-old narrator. Leilani describes the process of writing a good and beautiful book for the youngest readers.