Author: J.K. Rowling
Hardcover/Paperback Sold: 60 million
In the second installment of the Harry Potter series, our favorite boy wizard returns to Hogwarts after an awful summer with the Dursleys. Upon his return, Harry is thrilled that he can suddenly speak Parseltongue, the language snakes. Of course that doesn't compare to the fact that someone is turning Hogwarts' students into stone.