The Tristan Betrayal

In the fall of 1940, the Nazis are at the height of their power - France is occupied, Britain is enduring the Blitz and is under constant threat of invasion, America is neutral, and Russia is in an uneasy alliance with Germany.

The 39 Clues - Book 10: Into the Gauntlet

Into the Gauntlet is the tenth and final book in The 39 Clues novel series. It was written by Margaret Peterson Haddix  and released on August 31, 2010. In the beginning of the book, Amy and Dan think about if they ever should have joined the clue hunt, and every misfortune they've had. Their lead is a poem found in their hotel room. However, it is then stolen by Isabel Kabra.

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.