The 39 Clues: Doublecross

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, generals at his beck and call. Ian knows he's an ideal leader and the only man for the job. There's just one small problem: He's already messed up big time. A Cahill from the past calling himself the Outcast has risen to challenge Ian with an impossible test. The Outcast has re-created four of history's greatest disasters and dared Ian to stop him.

Never turn your back on the Cahills.... The most powerful family history has ever known returns with a vengeance in The 39 Clues: Doublecross! Confidential until August 2015!

The blockbuster series continues with a Cahill family member from the past bent on revenge! Who is the Outcast, and why is he threatening the lives of innocent people? Book 3 reveals a shocking secret that will send Amy and Dan - and the world - reeling.

The thrilling conclusion to 39 Clues, Part VI: Doublecross. A Cahill family member from the past is bent on revenge! Confidential until July 2016!