Cameron Post (Chloë Grace Moretz) is sent to a gay conversion therapy center after getting caught on prom night with another girl in the back seat of a car. Run by the strict and severe Dr. Lydia Marsh (Jennifer Ehle) and her brother, Reverend Rick (John Gallagher Jr.) -- himself an example of how those in the program can be cured -- the center is built upon repenting for same-sex attraction. In the face of intolerance and denial, Cameron meets a group of fellow sinners, including the amputee stoner Jane (Sasha Lane) and her friend, the Lakota Two-Spirit Adam (Forrest Goodluck). Together, this group of teenagers forms an unlikely family as they fight to survive.