Read the books.
thereis no code you can only get it by having an ipad ipodtouch or iphone then get the app and play the game.
Actually, their is not a code for this card. The only way to get it is by winning level 20 on the iPhone/ iPod Touch app, once you beat level 20, you enter your username and password into the iPhone/ iPod Touch, and it will add the card to your account. (iPhone/ iPod Touch app called "The 39 Clues: Madrigal Maze)
madrigal
you have to download the madrigal maze app on the i phone or i pod then you have to get to a certain level then enter your code and password and then you get it here is my agent card code p37jkkfpxp
There is a Madrigal watcher
You can become a madrigal by finishing mission ten but to do that you have to have all 39 clues.
You become a madrigal by completing Mission 10 on the 39 Clues site.
No you can't be a madrigal if you created an account on the 39 clues. Trust me I tried it once.
u cant be a madrigal but u can pretend :)
The branches in the 39 clues are Ekaterina, Janus, Lucian, Tomas and Madrigal
The 39 clues maze of bones was published on November 7th 2008.