King & Kayla are back on the case in this laugh-out-loud mystery from the Theodor Seuss Geisel Honor Award-winning series.Kayla needs to return her library books, but she can't find one of them. King knows that if they don't return all the books, they can't check out more—and that means no new stories. Analytical Kayla retraces her steps, with the assistance of their friend Jillian. Sensitive King smells a library book. Could it be lost in Dad's chair? Nope, that's a different book. In fact, it's a book that belongs to Jillian's little brother Adam. Can King and Kayla put the pieces together and find the lost library book?With simple, straightforward language and great verbal and visual humor, the King & Kayla series is perfect for newly independent readers. King and Kayla model excellent problem-solving skills, including working as a team, gathering facts, making lists, and evaluating evidence.