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The sole survivor of a home invasion where she famously witnessed the death of her mother and sisters, Libby Day (Charlize Theron) lives with the knowledge that her testimony as a 7-year-old sentenced her brother, Ben (Corey Stoll), to life in prison for the horrific crime. When a group of true-crime enthusiasts, The Kill Club, find Libby twenty-five years later and convince her to re-examine the events of that night, new memories and old suspects suddenly flood back into her life. As shocking information comes to light, Libby begins to question her own key testimony and sets out to discover the truth of her tragic past as the present collides with the things she thought she knew as being the truth…revealing another reality entirely.