Despite their seemingly perfect relationship, Agatha yearns for independence and breaks up with Simon. Simon reunites with Penelope and the shy goatherd Ebb, as well as his beautiful girlfriend Agatha Wellbelove. The book is also frequently interrupted by short chapters narrated by a character named Lucy, who reflects on her own times at Watford years ago, and her budding relationship with another student named Davy, a man obsessed with the prophecy of the Greatest Mage. Their appearance is attributed to the Humdrum. Around the time of Simon's birth, magickal 'dead spots' started appearing all over England, places where magick no longer exists, and magickal beings are unable to use their powers.

The prophecy states that one will come to end magick (believed to be a recently appeared creature called the Insidious Humdrum) and one (believed to be Simon) will bring its fall. Simon has an unprecedented amount of magical power, and is thus dubbed 'The Chosen One', the prophesied Greatest Mage.

Raised among the 'Normals' (humans without magickal powers) Simon was discovered as a child by his mentor The Mage, who is the headmaster of Watford, and the leader of the magickal world. Simon Snow is an 18 year old orphaned magician returning to Watford School of Magicks for his eighth and final year. However, Rowell has said that Carry On is a novel written by herself, and should not be seen as Cath’s fictional work “ Carry On Simon”, which features in Fangirl.

Carry On, Simon is the name of the novel-within-a-novel-based-on-a-book-series that Cath is writing in Fangirl. 'Simon Snow' is the name of the fictional series of novels that the protagonist in Fangirl (Cath) is a die-hard fan of. The novel is a spinoff from Rowell's novel Fangirl. 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. 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. Carry On: The Rise and Fall of Simon Snow is the third young adult novel written by Rainbow Rowell, published in 2015.

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