i have read the book and i must say that this movie stay true to form . i think this be the beginning of the psychological thriller in the same genre of psycho . cristina raines give an excellent performance a the lead and and burgess meredith give an excellent support actor a the next door neighbor . i have see this movie at least twice and i think that i be go to buy both the book and the movie for my collection . the suspense just keep build up to the climatic end and the twist you will never see come . if you like movie like sign and the village and the sentinel will be a classic prelude . also and what be interest be the actor in the movie you would not recognize them if you do not read the credit . the late jerry orbach be great a the commercial director and jeff goldblum be excellent a the photographer . also there be beverly dangelo and who be underrated but great .