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Here is deadline's synopsis of the film:
When 8-year-old Merry’s older sister exhibits signs of an indeterminate and terrifying affliction, the Barrett family slowly tears itself apart. Now, 20 years later, Merry is confronted with her family’s traumatic past when Rachel, a journalist with a similarly haunted past, delves into the case, causing Merry to relive and reconsider the devastating memories of her childhood.
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This is the second collaboration between Scott Cooper and the company Cross Creak. The first being Black Mass, which starred Johnny Depp.
Source material: Deadline.com