Deadbolt

When medical student Marty places an ad for a roommate, her ad is answered by handsome, clean-cut Alec. At first Alec seems to be a wonderful roommate; supportive, considerate and a real friend. However, Alec's affection turns to obsession as he plots to manipulate and control all aspects of Marty's life, imprison her in her own apartment and make her his. (imdb)