An anthropology professor's obsession with a paranormal mystery threatens her job, marriage, and sanity as she fights to find a missing student.

On Christmas Eve, 1968, in a Scottish coastal town, a debt collector goes to work to avoid confronting his wife's worsening psychosis at home.

When hundreds of videotapes showing torture, murder and dismemberment are found in an abandoned house, they reveal a serial killer's decade-long reign of terror and become the most disturbing collection of evidence homic…