Never turn your back on the Cahills . . . The most powerful family history has ever known returns with a vengeance in The 39 Clues: Doublecross! The Cahills are

A brand new adventure from the world of The 39 Clues!For 500 years, the Cahills have been the most powerful family in the world. For 500 years, they've protecte

The thrilling conclusion to 39 Clues Part VI: Doublecross. A Cahill family member from the past is bent on revenge! CHECKMATEThirteen-year-old Dan Cahill and hi

Follow the Leader At only seventeen years old, Ian Kabra is head of the Cahills, the most powerful family in the world. He has presidents on speed dial, general

Based on a real military program! The US Navy's new breed of soldier is ready to make a big splash. An action-packed, maritime military adventure from the autho