There are 11 books in the The 39 Clues series. The newest book is Vespers Rising which came out in 2011.

What would happen if you discovered that your family was one of the most powerful in human history? What if you were told that the source of the family's power was hidden around the world in the form of 39 clues? What if you were given a choice - take…
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2
One False Note

Book cover of One False Note
Super-selling author Gordon Korman sends Amy and Dan off on a wild chase in Book 2 of the highly-anticipated 39 Clues series. THIS JUST IN! Amy and Dan Cahill were spotted on a train, hot on the trail of one of 39 Clues hidden around the world. BUT WAIT! Police…

3
The Sword Thief

Book cover of The Sword Thief
ATTENTION! Amy and Dan Cahill have been located once again, this time in the company of the notoriously unreliable Alistair Oh. Could they have been foolish enough to make an alliance? Spies report that Amy and Dan seem to be tracking the life of one of the most powerful fighters…

4
Beyond the Grave

Book cover of Beyond the Grave
Amy and Dan are hot on the trail of the fourth Clue, but their ruthless relatives will stop at nothing to eliminate them from the competition. Their hunt leads them to an ancient city that has been a hot bed of Cahill activity for centuries. All that stands between the…

5
The Black Circle

Book cover of The Black Circle
INCOMING! Amy and Dan have been found UNHARMED! But perhaps not for long - the ruthless Irina Spasky is right on their tail. And WHAT are those crazy kids doing poking their noses into Lucian secrets?!? Are they TRYING to get themselves killed? The 39 Clues Book 5 takes Dan…

6
In Too Deep

Book cover of In Too Deep
Seven years ago there was a terrible fire. Dan and Amy Cahill were saved, but both of their parents died. The fire was ruled accidental, and Dan and Amy had no reason to believe otherwise ...until now. What really happened that awful night? Was the fire a tragedy ...or was…

7
The Viper's Nest

Book cover of The Viper's Nest
Shaken by a shocking loss, Amy and Dan flee to an exotic land and trace the footsteps of their most formidable ancestor yet: a military leader of mythic proportions. But just as the siblings begin to master the art of ancient warfare, they confront a dangerous enemy \- the truth.…

8
The Emperor's Code

Book cover of The Emperor's Code
The "New York Times" bestselling series. As the race to find the 39 Clues builds to its explosive finish, Amy and Dan must steal a Clue guarded by thousands of the world's best soldiers. With their enemies closing in, the siblings are separated. Together, they almost have a chance, but…

9
Storm Warning

Book cover of Storm Warning
The New York Times bestselling series. On the hunt for the 39 Clues, Amy and Dan Cahill uncovered shocking information about their past - from what happened the night their parents died to the shattering discovery about their family branch. But the biggest secret of all remains behind Grace Cahill's…