Carry On: The Rise and Fall of Simon Snow is the third young adult novel written by Rainbow Rowell, published in 2015. The story follows the final year of magical schooling for Simon Snow, the "Chosen One" of the Magical world, prophesied to defeat the Insidious Humdrum, an evil force that has been wreaking havoc on the World of Mages for years. The novel is told through several narrative voices, including that of Simon, his roommate/enemy Baz, his best friend Penelope, and his ex-girlfriend Agatha.