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 enough for the job. There’s just one small problem: He’s already messed up big-time.

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 the world's most powerful family, but their strength is being tested. A sinister man calling himself "The Outcast" has targeted the family and set them an impossible test. He's recreating four of history's worst disasters and challenging the young Cahills to find and stop the tragedies before it's too late. Now, with one disaster behind them, siblings Dan and Amy Cahill and their friends have just days to discover what the Outcast's next move will be. Their frantic search seems to be pointing toward a terrifying air disaster, the explosion of the Hindenburg airship. But no one travels by airship anymore -- what do the Outcast's cryptic messages mean? The young Cahills must split up and take to the skies to try to find the answer . . . before their whole world comes crashing down.

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!