This book has Percy, Grover, and Annabeth but it starts new series. It introduces many new characters. The three main are Jason, Piper, and Leo. They all go to Wilderness Boarding School. Jason wakes up holding hands with a girl that says she is his girlfriend and a guy that says he is his best friend. The girl, Piper, has a really big secret; her dad has been missing for three days! The guy, Leo, is really good with tools. While on a field trip, there is a freak storm and some weird creatures appear. The three friends are whisked away to someplace called Camp Half-blood. And then they all end up going on a big adventure.
Bottom line: This is a great book. I love all of Rick Riordan’s things. I think this book is for about 5th graders and older. This book has more violence because it is meant for older kids. But I still recomend this wonderful book.