Lily.
It is Lily
Margaret Peterson Haddix is writing the final 39 Clues book 'Into The Gauntlet'
The last clue is the serum formula.
It means that 29 of the 39 clues are currently available.
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They only have 39 clues.
Online, the second clue in the 39 clues is hydrogen. But in the second book of the 39 clues is tungsten
There is no misssion 12 in the 39 clues.
There's only 39 clues!!
no cheating in the 39 clues!
There is no cheat in any games in the 39 clues.
It is already available at the 39 clues mission.