As a great admirer of the late Joan Hackett's work, I came across this film so I had to see it. The performances are outstanding. Sam Waterston is hateful and eerie, I cant believe it's the same man I watch on Law and Order. Tuesday Weld and Joan Hackett are riveting in their performances. The suspense never stops. For a film that was done in 1974 - it can hold up to any suspense film written today. I saw the original movie and it was quite good, but, the way John Badham directed this film, it tops all the other remakes, including the most recent with Sharon Stone and Isabelle Adjani.