This is one remarkable film.
Seance on a Wet Afternoon is about a psychic (Stanley) and her husband (Richard Attenborough). They live in a large Victorian and she brings in money by holding weekly seances. She persuades her husband to kidnap the young daughter of a wealthy man. The plan is that she will then lead the authorities to the child, resulting in her getting publicity for her gift--a gift she genuinely believes she has.
Kim Stanley made 4 theatrically released films, 5 if you count her narration for To Kill a Mockingbird. Other than a couple of filmed stage performances and a TV adaptation of Cat on a Hot Tin Roof, that's it.
After seeing her in this, I am regretting both that I never saw her on stage and also, that she didn't make more movies.
Richard Attenborough is superb as well and the direction is excellent.