After a member of her competitive cheerleading team is injured in practice, sixteen-year-old Marnie is asked to be a flyer-the most coveted role in cheerleading. The Soar Starlings team has a real shot at the provincial championship, and Marnie has only a few weeks to prepare. But as she scrambles to polish her lifts and throws, Marnie's personal life begins to unravel. First, her boyfriend of two years breaks up with her, and then her best friend Arielle, captain of the Starlings, disappears during a team trip to Toronto. As Marnie struggles to adjust to being both a flyer and the team's new captain, she realizes that, to be a leader, you have to let go of old alliances to make room in your life for new ones.