Rick Riordan is the author of the Percy Jackson novels as well as its many spin-offs, and each book has a reason to be considered one of his best. The first and last books in The 39 Clues series ...

Built around a ripe conceit—wealthy matriarch scatters cryptic clues ... series, in which young characters are demigods—half-human offspring of the gods of Greek and Roman... Rick Riordan ...