Directed by Bob Clark, this 1974 horror film is a chilling tale set during the Christmas season, where a group of sorority sisters find themselves terrorized by a mysterious and menacing caller. As the tension escalates, the women must confront the terrifying reality that the threat may be closer than they think. The film stars Olivia Hussey, Keir Dullea, and Margot Kidder, delivering memorable performances that contribute to its enduring legacy in the horror genre. Notably, this movie is often credited with helping to pioneer the slasher genre, influencing many films that followed. For those interested, it can be viewed for free on 123Movies / Movies123.