You must have all 39 clues in order to continue with the final mission. You can get these "clues" by playing the missions in the 39 clues website, buying the books and entering the code in the cards you got, and buying a card pack; Example:P4G4MPNNXP. Sorry but even I haven't done it.
You solve mission nine by
You have to solve the magic boxes,and solve the cairn.
Read it backwards
you need all the clues
You become a madrigal by completing Mission 10 on the 39 Clues site.
Tikal, Guatemala.
It is already available at the 39 clues mission.
it already came out
It already came out.
Same as Book 10.
In mission 10 of The 39 Clues series, the NRP is the National Rescue Project, an organization that plays a key role in the story.
you have to click on the cards and try to mach the image