Book One: Mission Titanic
Book Two: Mission Hindenburg
Book Three: Mission Hurricane
Book Four: Mission Atomic
Doublecross Message Board:
I got Unstoppable: Book 1, today!!! (5 days before it comes out):-D *SPOILERS!
WHO ARE YOU MOST LIKE QUIZ!!!
Did the 39 clues REALLY happen? please tell me!!!
39 Clues, Harry Potter and Percy Jackson- A comparison (Those who have no read at least 2 of these series, turn back)
Irina Spasky Versus Alistair Oh: Who do think is better?
I need help with the new missions! Is anybody else having this problem?
Who is your favorite character of all time in this series?
List of all the 39 clues 400 cards
The Medusa Plot Secret codes: Answers Revealed
know any cheat codes