The 39 Clues is unstoppable! The bestselling series returns
with an adventure spanning four explosive new books.
As a member of the most powerful family history has ever known,
thirteen-year-old Dan Cahill has been shot at, kidnapped, and even
thrown into a pit with a deadly snake. He''s survived it all due to
luck, smarts, and his older sister, Amy, who always sticks by his
Now Dan and Amy are facing their greatest threat yet, an enemy
who has found a way to use the source of the Cahill family power
against them. To stop him, Dan and Amy must set out on a desperate
mission that will take them from one of the world''s hottest
regions all the way to the frozen blast of the Arctic Circle. But
with the enemy closing in, Dan finds himself facing the one terror
he never imagined - being betrayed by his own sister.