Caroline (Hudson), a live-in nurse, is hired to care for an elderly woman's ailing husband in their home - a foreboding and decrepit Gothic mansion in the marshy backwoods just outside of New Orleans. Intrigued by the enigmatic couple and the dark and mysterious surroundings, Caroline begins to explore the old mansion. Armed with a skeleton key that unlocks every door, she discovers a hidden attic room that holds a deadly and terrifying secret. Caroline soon discovers that the mansion is haunted by a pair of century old spirits. The spirits are evil and are manipulating the living to fit their desires, and Caroline herself is at the centre of one of their sinister schemes.