In Julie Anne Peters' novel "Luna," sixteen-year-old Regan grapples with her older brother Liam's secret identity as Luna, a transgender girl. During the day, Liam lives as a typical high school boy, but at night, he transforms into Luna with the help of his sister's clothes and makeup. As Luna prepares to come out, Regan fears the reaction of their family and friends. The novel explores the challenges and emotional complexities of navigating a family's response to a transgender family member.