If you have been following the brother and sister team in this series, you are probably anticipating 39 Clues book #10. This book, Into the Gauntlet by Magaret Peterson Haddix, is the last in the fast paced mystery and adventure series and is due out on August 31st.
For anyone new to 39 Clues, the library has copies of all of the previous nine books in the series. Once you start reading the series, it will be hard not to root for Amy and Dan as they work to finally find out all the answers to their questions.
39 Clues fans may also be happy to know that there is an online component to the series. Check out Scholastic Book Group's 39 Clues website and a teaser/trailer for the upcoming movie.
If you liked 38 Clues, try the following books/series:
Percy Jackson and the Olympians... Series by Rick Riordan
Hunger Games by Suzanne Collins
Eleven by Patricia Reilly Giff
Peter and the... Series by Dave Barry
Bone Series by Jeff Smith
Gods of Manhattan by Scott Mebus
Mysterious Benedict Society by Trenton Lee Stewart