The Viper's Nest

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.

The Sword Thief

Spies report that Amy and Dan seem to be tracking the life of one of the most powerful fighters the world has ever known. If this fearsome warrior was a Cahill, his secrets are...

Vespers Rising

Defend the CluesFourteen-year-old Amy Cahill and her younger brother, Dan, thought they could return to theirregular lives when they found the 39 Clues that safeguard their...

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