Fangirl

Cath and Wren Avery are identical twins who grew up sharing everything, including an obsession with Simon Snow, a bestselling series about a boy at a school for magicians. Cath writes a famous online story set in that world, read by tens of thousands of fans. When the sisters arrive at the University of Nebraska, Wren announces that she wants a different roommate and a different life.

Cath ends up sharing a room with Reagan, an older student with zero patience, and Reagan's easygoing friend Levi, who seems to be there all the time. She would rather eat protein bars in her room than find the dining hall. In her advanced fiction-writing class, a demanding professor wants her to write something truly her own, and a charming classmate wants to write with her. Meanwhile Wren is partying hard, and their father, alone at home in Omaha, is struggling. Between chapters, short passages from the Simon Snow books and from Cath's fan fiction show how much the story she loves means to her.

Cozy and honest about anxiety, family and growing up. About 448 pages. The Simon Snow world later got its own books, starting with Carry On.