All the 39 Clues Books, Ranked Best to Worst

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Cast your vote for the best 39 Clues books!

Whether you've read all 39 Clues books or are trying to decide which one to read first, you've come to the right place. Fans of the series have come to adore the narrative that intertwines family rivalry, mystery, clue cracking, and actual historical events to make an intricate and compelling narrative arc. Beginning with Benjamin Franklin, the titles have touched on everything from the Hindenburg disaster to the Bubonic Plague. Here, you'll find all 39 Clues books ranked best to worst by fans! 

Through the course of many installments, every 39 Clues book has been covertly educational. When embroiled in the Cahill family's quest to find a serum to create the most powerful person on earth, young adult readers miss the fact they're actually learning something. For books that teach kids a better understanding of world history, browse this list! 

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