The Gatsby Kids and the Outlaw of Sherwood is a middle-grade adventure and I really ended up loving this book! I liked the characters, clever writing and story.This book kind of has the vibe of The Magic Tree House. Three siblings go back in time on accident and mess something up so they must go back and save the day, namely, Robin of Loxley. I love how the story unfolds and they help the hero and the hero helps them. I keep thinking the kids in this story are younger than they are in the book, but it doesn't take away from great characters.In the back of the book, the author asks Is Robin of Loxley real and gives his two cents on that answer. He also sites some of the sources he used to write the book, which is great for younger readers who may have never seen a book sited before. This gives them a chance to understand how research is done.I think this is a great book for late elementary school children who like adventure books like The Magic Tree House.