Abysmal thriller. Intensely unsettling film with an interesting idea torpedoed by snail-like pacing and sterile atmosphere. What Hitchcock could have done with this!

Much more effective than it should be

Almost worth watching for the ridiculous conceit of Kristy McNichol as a jazz flute player... for musicians, the scene where she's jamming with her combo is unintentionally hilarious. A rather strange little thriller.