there are 4 card packs in the 39 clues series.
Normal packs: 9 cards Duelist Pack packs: 5 cards + 1 Strategy card Tournament Packs: 3 cards Gold Series packs: 20-25 cards
There are 6 clue cards in the first book of The 39 Clues series. Each card reveals an important clue or hint as part of the overarching mystery explored in the series.
4
A typical box of trading card game booster packs contains around 36 packs.
there are 16 cards in each card pack
6 books and 2 card packs
There are too many to be solved
You can ask people for their card codes, and many have posted theirs online. A google search with "39 clues agent card codes" would probably work.
There are going to be six.
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12 right now there will be a new series called Vespers vs. Cahills in august