The 39 Clues really isn't a mystery series. It's more of an adventure/peril series.
The eighth book in The 39 clues series is 'The Emperor's Code.'
there are 4 card packs in the 39 clues series.
Yes, it's a popular series!
No, the series is fictional.
There is not going to be a 12th 39 Clues book, but there is going to be a new 39 Clues series. The first book in the new series is called The Medusa Plot by Gordon Korman.
silk
The "39 Clues" series is classified as a children's adventure/mystery series. It combines elements of history, adventure, and puzzle-solving as the characters travel the world in search of clues to unlock a secret.
Tungsten
Rick Riordan
The story is a work of fiction.
There are clues at the end of the last book that there will be another series comming out but no name of or no clues of what or who it will be about.