Cooper loves solving puzzles and mysteries but has struggled to make friends. So, he sees summer camp as his chance to make a name for himself. When he uses his detective skills to help other campers, it looks like he might have solved the mystery of how to form new friendships. But are Cooper and his group of Summer Camp Sleuths up for solving the curious case of the disappearing marshmallows? Characterized by exciting, fast-paced plots and age-appropriate themes, Lighthouse's Hi-Lo books are both engaging and easy to read. Short chapters, simple sentence structures, and an accessible format make these books perfect for lower tween reluctant readers. Lighthouse books are written at a 1st- to 2nd-grade reading level with an interest level of ages 7 and up.