After the sudden death of their wealthy father, two estranged sisters reunite to sort out the family estate. To her shock, conservative Billie inherits nearly everything, while rebellious Harriet is left with a meager trust fund payment. As jealousy and scheming erupt, Billie begins hearing eerie, unearthly noises. With her sanity unraveling, she must confront a buried childhood secret shared with Harriet one tied to the terrifying supernatural force known as "The Barghest".