The Cahill family has a secret. For five hundred years, they have guarded the 39 Clues -- thirty-nine ingredients in a serum that transforms whomever takes it into the most powerful person on earth. If the serum got into the wrong hands, the disaster would rock the world. So certain Cahills have always made it their mission to keep the serum safe, buried, locked away. Until now.
Author : Jude Watson