The 39 Clues series continues to gain steam. Congratulations to Jude Watson, whose installment Beyond the Grave debuted at #11 in USA Today, the highest debut yet for the series. 39 Clues is also #3 on the New York Times children's series bestseller list. According to USA Today, Scholastic Books is reporting over 3 million copies of the books in print and 600,000 users on the 39 Clues site. That's a lot of Cahills!