Dark Places follows Libby Day, the only surviving witness of a horrific massacre that took her mother and sisters. Believing the slaughter to be the work of a Satanic cult, Libby testifies in court against her own brother. 25 years after the murder, she remains haunted by the gruesome violence. Libby meets a group of amateur investigators looking to satisfy their morbid curiosity. “The Kill Club” begins their own inquiry into the case, believing Libby’s brother innocent. In order to help them, Libby must unearth painful memories of the event, and learn that her past may not be what it seems.