As a child, Libby Day was the sole survivor of a massacre that killed her family in what appeared to be a satanic ritual, and she later testified against her brother in court. Twenty-five years later and in need of money, she agrees to join a group of investigators 鈥 for a fee 鈥 who believe her brother is innocent. But soon, she finds herself on the run from a killer once more. Charlize Theron stars. "Dark Places" hits theaters September 1.