The Vortex (1969)

Fearing aging and the loss of her youthful beauty, a society woman (Margaret Leighton) takes on a much younger lover (Barry Justice) and doesn't bother to hide it from her husband (Patrick Barr). When her son (Richard Warwick) returns home after a year in Paris with a fiancee (Felicity Gibson), it facilitates a showdown. Based on the 1924 play by Noel Coward and directed by Philip Dudley. Quite controversial for its day with the subject of drug use (possibly a metaphor for homosexuality), Coward's aristocratic circle features such shallow and vain or weak willed inhabitants that it's difficult to drum up much empathy for them. Even as the play ends and the mother and son promise to change, you know they'll continue to go on just as they are: deluded and feeble. The acting is quite good with Leighton giving a stellar performance and Warwick ambiguous enough to make you wonder. With Alan Melville, Nancie Jackson and Jennifer Daniel.