Get ready for an action-packed adventure with The 39 Clues Series by Margaret Peterson Haddix and Rick Riordan. This hardcover book collection includes books 1, 4, 5, 8, 9, and 10 of the series, perfect for mystery and adventure lovers. Follow the Cahill family as they race across the globe in search of clues that will lead them to ultimate power. Written in English, this book series is published by Scholastic and is perfect for readers who love action, adventure, and mystery genres. Join the Cahill family and experience the thrill of the hunt for the 39 clues.