There is a special chemistry at work in this movie, and its results are chilling. Tuesday Weld is far from the "Dobie Gillis" bimbo as she has often been portrayed. Joan Hackett is eerily on target and Sam Waterston is complex and intriguing. Especially effective (and spooky) is the set -- e.g. the swimming pool full of leaves in the autumn -- that contains who-knows-what. The original "Diabolique" has a classier title, but has fewer edges than this film. Highly recommended.