Mission Titanic (The 39 Clues: Doublecross, Book 1)

At just seventeen, Ian Kabra leads the powerful Cahill family and faces a daunting challenge when an adversary known as the Outcast re-creates historic disasters and threatens lives. To thwart this threat, Ian must locate his former allies, Amy and Dan, and decipher the cryptic clues left by the Outcast. The stakes are high, and accomplishing this task will require Ian to make significant sacrifices.