This really is a plain and simple homage to Alfred Hitchcock type film. Everything from the femme fatale, conspiracies, and “every man with a psychologic condition” is present here. Even the music was specifically composed to sound like the classic Bernard Herman music used in most of Hitchcock’s most famous films.
Roy Scheider does a great job as always, playing the lead and Janet Margolin turns in a surprisingly strong performance as the tragic love interest. The first 30 minutes are especially great. Awesome set up, tight pacing, intriguing. The 2nd act struggles a bit as the revelations slow way down. Luckily, the final 15 minutes are taut with tension and the ending is absolutely perfect. If you like thrillers like Chinatown or Hitchcock’s Vertigo, you will dig this too.