39 Clues: Series 1

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. But tailed by a pack of power-hungry relatives, Amy and Dan can't see if they are sailing toward victory - or straight into a deadly trap.

When the hunt for the 39 clues leads 14-year-old Amy Cahill and her younger brother, Dan, to Japan, their only chance to find the third Clue seems to lie with their unreliable uncle, Alistair Oh. Will they be foolish enough to make an alliance? With a Clue on the line, Amy and Dan might not have a choice. But in the Cahill family, trusting your relatives can get you killed.

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? It's a wild race that will take Amy and Dan deep into the bowels of the earth... and right into the hands of the enemy.

Governments were toppled and rulers were killed during the last attempt to find the lost treasure Amy and Dan Cahill are searching for - do they even stand a chance?

Amy and Dan make shocking discoveries about their family's power and their parents' deaths as they track the next clue to a remote corner of the world.

While learning the art of ancient warfare in an exotic location, Amy and Dan uncover a devastating secret about their family that changes everything in this high-stakes adventure.

Amy and Dan must steal a Clue guarded by thousands of the world’s best-trained soldiers. With their enemies closing in, the brother and sister are separated. Now how will they stand a chance?

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?

Once Amy and Dan Cahill's choice was simple - take a million dollars or the first of 39 Clues that lead to the source of unimaginable power. Now it's clear that the hunt for Clues is bigger than anything that Amy and Dan could ever have imagined.

Fourteen-year-old Amy Cahill and her younger brother, Dan, thought they could return to their regular lives when they found the 39 Clues that safeguard their family’s great power. But they were wrong. Powerful enemies – the Vespers – have been waiting in the shadows. And they’ll stop at nothing to grab the Clues. Four powerhouse authors unite to expose the 500-year-old secret struggle between the Cahills and the Vespers. The Vespers are rising . . . and the world is in jeopardy.