No, but there is book 11, Vespers Rising, which is the last book of The 39 Books series. There will also be another series to be released this 2011 related to the Cahill's war against the Vespers.
the boy in the 39 clues books is called Dan cahill and the girl is called Amy Chaill
only 39 clues... hence no 41st clue
You have to play all the missions and get all the books and the card packs
Buying Books
There are 11 original books in "The 39 Clues" series that are possible to get in hardback. These books are written by various authors and follow the story of two siblings in a worldwide hunt for 39 clues that will determine the family's power and fortune.
Read the books. Collect the cards. Play the game.
I played that game. You have to solve the clues online. But if you want the hand held card. You have to go and buy the 39 clues books. There should be 10 books.
the books will only give you ten clues so the cards fill in the gaps along with the 39 clues website
39. Each book has 1 clue.
add book codes
Scholastic books p2fhhndhxp
It depends on how many missions and books are out and how many cards you have.