Sarah Wolfe was the only living survivor from the massacre at the Vanacutt Mansion, but no one believed her claims that ghosts were responsible for the gruesome murders that took place there. Now her recent and questionable suicide leaves her sister, Ariel, no choice but to devote herself to finding out who - or what - was responsible for her death. Ariel discovers that Sarah sent her the diary of the sadistic Dr. Vanacutt just before she died, offering clues to the diabolical evil that resides within the house. But the diary also makes Ariel a target in a deadly treasure hunt that leads a group of unwitting victims back to the Vanacutt Mansion, reawakening the terror imprisoned within the house on the hill.