Series

"Let the story of my niece and nephews be a warning. The more you know, the more danger you're in. And trust me, you don't want to meddle with the Little People."

-S.S.

Less than half a year ago, Tony and I received a mysterious note from Jared, Simon, and Mallory Grace, three children who have experienced authentic encounters with the beings we call faeries. As hard as it was for us to believe, we came to see that there was no alternative explanation. Now, putting aside personal concerns, we bring their stories to you.

Less than half a year ago, Tony and I received a mysterious note from Jared, Simon, and Mallory Grace, three children who have experienced authentic encounters with the beings we call faeries. As hard as it was for us to believe, we came to see that there was no alternative explanation. Now, putting aside personal concerns, we bring their stories to you.

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 a million dollars and walk away...or get the first Clue? If you're Amy and Dan Cahill, you take the Clue - and begin a very dangerous race.

The race is on to find 39 Clues that safeguard a great power, and 14-year old Amy Cahill and her younger brother, Dan, are shocked to find themselves in the lead. The search seems to be taking them to Vienna, and they hold a coded piece of Mozart's sheet music that's the key to finding the next Clue.

There's only one rule in the race to find 39 Clues hidden around the world: TRUST NO ONE.

A Clue found in Book 3 sends Amy and Dan jetting off to find out just what's behind the fierce rivalry between the Tomas and Ekaterina branches of the Cahill family. Was a Clue stolen from the Tomas branch? Where is it now? And most important, can Amy and Dan get their hands on it before their rivals do?

A hint from their parents' past puts Amy and Dan on the trail of secrets their grandmother Grace would NEVER have wanted them to know. Awful memories begin to crowd in on Amy, just as her enemies circle closer. How far would she go to protect Dan? How much of a Cahill is she prepared to be? Perhaps Grace was right - some secrets are better left buried.

It's no longer a game. The body count is rising. Shaken by recent events, Amy and Dan flee to a distant land and trace the footsteps of their most formidable ancestor yet: a military leader of mythic proportions.

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 of their family branch. Will Book Nine be the end of Amy and Dan? Or just the end of everything they think they know?

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 alone.... Could the search for this Clue spell the end of Amy and Dan?

Jack and Annie of Frog Creek, Pennsylvania, know they have to find one of the four secrets of happiness to help save Merlin the magician. But when the magic tree house whisks them off to a misty island in the middle of nowhere, they wonder how they will find anything. As the fog lifts, they see a huge three-masted ship - could it be a pirate ship?

Jack and Annie continue their quest for the secrets of happiness - secrets they need to save Merlin. This time, the Magic Tree House takes them to the one continent they haven't visited before: Antarctica! What can they hope to learn about happiness in such a barren place? Only the penguins know for sure...Jack and Annie are about to find out!

Jack and Annie head to 18th-century Austria, where they must find and help a musician by the name of Mozart. Decked out in the craziest outfits they've ever worn, including a wig for Jack and a giant hoopskirt for Annie, the two siblings search an entire palace to no avail.

Jack and Annie are on their second mission to find and inspire artists to bring happiness to millions. After traveling to New Orleans, Jack and Annie come head to head with some real ghosts, as well as discover the world of jazz when they meet a young Louis Armstrong.