The 39 Clues - Book 9: Storm Warning

Storm Warning is the ninth book in The 39 Clues series. It is written by Linda Sue Park and was released on May 25, 2010. The geographical coordinates  that appear on the ship on the book's cover (18 degrees, 15 minutes north; 77 degrees, 30 minutes west) indicate a point about six kilometers southeast of Albert Town, Jamaica.

The 39 Clues - Book 8: The Emperor's Code

The Emperor's Code is the eighth book in The 39 Clues series. This book is written by Gordon Korman. On March 2, 2010 the cover was revealed to show a red mask with codes printed in certain areas over a purple background. After this release, readers were asked to find three out of the four codes printed on the mask, and, if they were successful, 39 Clues fans could read an excerpt from The Emperor's Code.

The 39 Clues - Book 7: The Viper's Nest

The Viper's Nest is the seventh book in The 39 Clues series. It is written by Peter Lerangis and was released on February 2, 2010. The 39 Clues series is intended for children aged 8-12, and takes the form of a multimedia adventure story spanning 10 books. The stories focus on brother and sister, Amy and Dan Cahill, and their efforts to piece together clues left by the matriarch of the family, Grace Cahill, on her death.

The 39 Clues - Book 6: In Too Deep

In Too Deep is the sixth book in The 39 Clues series. It was written by Jude Watson and released on November 3, 2009. The story is set in Australia and Indonesia.

The 39 Clues - Book 5: The Black Circle

The Black Circle is the fifth book in The 39 Clues series and is written by Patrick Carman. This book was released on August 11, 2009. Amy and Dan Cahill, the protagonists of the series, try to follow a Lucian secret. They also encounter the infamous Madrigals.