With the Kentwood encoded books now safely housed at an all-girls school, Jarod and Tommy have a new summer assignment from Brindly. Armed with junk food and a copy of two lines of code from the master book, they head into the school to try their hand at each decoding a book on their own. But once inside the high-security walls, they discover there are even more secrets inside the library than just his collection of magical books. Everything is a great new adventure until the girls of the school step in to help, and the secret items so carefully encoded into the books for hundreds of years are now in danger of falling into the wrong hands. It's suddenly up to just them to get their mission back on track and all the items safely secured in the Greenhaven vault.