This book series is great for children ages 7 - 13, as they can relate with what Frank and Joe Hardy are doing and what mystery they are attempting to solve. The book, The Hardy Boys - Hopping Mad - Book 4, discusses problem solving skills, working together, cheering others on, not accusing others, problem solving, figuring out the truth, being honest, and being a good friend/sibling. The comprehension questions in this product relate with the text as well as students own experiences. Vocabulary