You have to buy them, but some of the books are on Kindle.
on pen island . com
Sorry, you have to buy the book or get it on ebooks. Nobody will let you read on the internet.
Read the books. Collect the cards. Play the game.
Read it backwards
you have to read all the books of th3 39 clues which you can buy in schoolastic or other places, but the cheat code is P4G4MPNNXP
You have to read this book, it is the best book in the world! its about these kids who are searching for 39 clues!
read book eight
Read the books.
go read the books.
go read the books.
It's a book series. If you haven't read them, you're missing out.
read the one wiki answer before this one.