The Heretics (2017) on Netflix

Plot summary

Gloria Farrow lives with her mother Ruth and attends a church therapy group with her girlfriend Joan, who is planning something for their anniversary. On her way home alone, Gloria is abducted by Thomas, a man whose face is scarred by fire. He chains her inside his RV and drives her toward his family's cabin in the woods; she manages to leave a frantic message for Ruth. There Thomas tells her he belonged to the cult that took her five years earlier, and that the members who survived intend to finish their ritual under the coming locust moon. When Officer Carter says the police can do little, Joan organizes a search with Kent and other church volunteers.