If you liked this movie, you should also see: Dirty Harry (1971)Mississippi Burning (1988)Assault on Precinct 13 (1976)Taxi Driver (1976)The Thing (1982)
Realising his secret girl-friend Dorothy's pregnancy will sour her relations with her ultra-rich father, career-minded Philadelphia student Jonathan Corliss coolly murders her, making it look like suicide. He then moves to New York to woo her twin sister Ellen. All seems to go well for him, although Ellen's continued investigations into what she is convinced was no suicide forces him to kill again.