Black Christmas (former titles include Silent Night, Evil Night and Stranger in the House) is a 1974 Canadian independent psychological slasher film directed by Bob Clark and written by A. Roy Moore. It stars Olivia Hussey, Keir Dullea, Margot Kidder, Andrea Martin, Marian Waldman and John Saxon. The story follows a group of sorority sisters who are receiving threatening phone calls, while being stalked and murdered during the holiday season by a deranged murderer hiding in the attic of their sorority house.