This set of 10 books features the popular adventure and fantasy series, The 39 Clues. Written by various authors and published by Scholastic, this set includes a mixture of hardcover and paperback novels. These books have been previously owned. The books are written in English and are ideal for those interested in the adventure and fantasy genres. The 39 Clues is a great addition to any book collection and is perfect for both young adults and adults alike. See photos for titles and condition.