The message is "Bring back the green diamond."
Sinead
The answer to the puzzle in The 39 Clues book 3 is "Marie Curie."
Card #3 comes with the 1st book of the 39 clues:The 39 Clues: Book 1: The Maze of Bonesin the book there are Cards #1, #2, #3, #4, #5, #6.
3-5
In April 2009.
Mission 3 comes out in April 2009.
Type this P23HRFXFXP in your cards to unlock 3 clues. Real and reusable.
The Sword Thief by Peter Lerangis
156 pages
its P3KM69DWXP
The 39 clues card 135 is a magic eye picture if you ajust your eyes properly you will see a 3-d letter...M
There really is no cheats in the 39 clues but the easiest way is to have two people one person does 1 & 2 and somone else can do 3 & 4.