After escaping from a violent cult in rural New York, Martha (Elizabeth Olsen) tries to reconnect with her estranged sister, Lucy (Sarah Paulson), and Lucy's well-to-do husband, Ted (Hugh Dancy), but the brainwashing she endured continues to prevent her from forming an identity of her own. Overwhelmed with paranoia, guilt and shame, Martha isolates herself until Lucy begins to suspect her sister's emotional trauma has deeper underlying causes.

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