"Leah on the Offbeat" is a young adult novel by Becky Albertalli, focusing on Leah Burke, a high school senior navigating her identity and relationships. As a bisexual girl, Leah grapples with her feelings for her best friend, Simon Spier, and the complexities of her friend group. Set in the same universe as Simon vs. the Homo Sapiens Agenda, the story explores themes of friendship, love, and self-acceptance. Leah's journey highlights the challenges of coming out and the importance of being true to oneself while dealing with the pressures of adolescence.