Cath Avery enters college with a love for the Simon Snow series that defines her life. She adores the books, writes fan fiction, and participates in the fan community alongside her twin sister, Wren. But as they start college, Wren is ready to leave the fandom behind, leaving Cath feeling abandoned. Without her sister by her side, Cath faces a slew of challenges: a standoffish roommate, her roommate's ever-present boyfriend, a creative writing professor dismissive of fan fiction, and a classmate who engages her in unexpected ways. Amidst these trials, Cath worries about her father's well-being. At the core of her journey is the question of whether she can navigate this new life without Wren's guidance, and if she's willing to let go of the Simon Snow universe as she grows up.