As the festive break begins, the residents of a sorority house find themselves tormented by a series of obscene phone calls. But when one of the young women disappears, the disturbing messages give way to something far more sinister. With a relentless killer hiding in plain sight and panic mounting inside the house, the survivors must confront an unseen evil before Christmas comes to a bloody end.

Steeped in atmosphere and mounting dread, and featuring an iconic cast headlined by genre stalwarts Olivia Hussey, Margot Kidder and John Saxon, this Canadian classic is a landmark of psychological terror whose shocking ingenuity and nerve-shredding suspense make it one of the most influential horror films ever made.