read the one wiki answer before this one.
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.
madrigal
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)
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 become a madrigal by completing Mission 10 on the 39 Clues site.
You can become a madrigal by finishing mission ten but to do that you have to have all 39 clues.
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.