Books 1 thru 10 of the 39 Clues Books. These books are great books to get your kids interested in math, science, history, music, art and the joy of reading. Online you can find teaching plans that can be used with each book for free. These lesson plans have experiments or more discussions about some of the people or places the books have discussed. These are great for any kid, teen, or young adult to read. They are also great for teachers and home school mom's to engage their kids in learning.