In 1993, teenager Cameron Post is caught by her boyfriend having a sexual encounter with another girl, Coley Taylor, on homecoming night. Cameron's aunt Ruth, a devout Christian, sends Cameron to God's Promise, a gay conversion therapy centre for teenagers. It is run by the strict Dr. Lydia Marsh and her brother, Reverend Rick, who claims that his sister’s methods cured him of his own homosexuality after two members of his church "rescued" him from a gay bar. Cameron's roommate, Erin, is an earnest believer in the camp's program.