Interest LevelReading LevelReading A-ZATOSWord Count
Grades 4 - 8Grades 2 - 5n/a4.546016

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.

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. If Ian and his allies can’t decipher the Outcast’s hints in time, innocent people will die. Ian’s only chance to beat the Outcast is to track down his former allies, Amy and Dan. But finding Amy and Dan will demand from Ian an impossible sacrifice . . .

Hardcover, 240 pages
Published on February 24, 2015 by Scholastic Inc.
ISBN-10: 0545747813
ISBN-13: 9780545747813
39 Book Reviews
  • x-winglover
    x-wingloveralmost 2 years55 stars
    I would love to read this book of The 39 Clues: Doublecross Book 1 Mission Titanic because I never read this book before even though I love Titanic so much that I have a picture frame of Titanic herself and her twin sister Olympic on my wall in my room and also I have a poster of Titanic and 3 books of Titanic 1 is Unsinkable, 2 is Colition Course, and 3 is SOS. And also SOS Titanic book.
    • Student.comover 2 years
      goodz book
      • aria123
        aria123over 3 years55 stars
        I love the 39 clues serie they are great books to read I have read at least five of their books and at the first page of the first book I practicly got atached to the books.
        • Hannahalmost 4 years
          I love this book
          • HIover 5 years
            HE DID NOTHING
            • SUP DOGover 5 years
              I DIDNT DO ANYTHING
              • SUP DOGover 5 years
                • ribertover 5 years
                  • Gotyover 5 years
                    Ehats rule the others drool is the hidden message
                    • booklover119
                      booklover119almost 6 years
                      as a 39 clue fan i read all 3 series and when i heard titanic i was so excited and i feel so bad because i did not finish cahill v.s vesper. I loved this book and finished it on the first day i got it. SSSOOO GGGOOOOOODD.