Shock to the System (The Donald Strachey Mystery series Book 5)

Young Paul Haig dies after hiring PI Donald Strachey. Despite his dislike of her, Strachey agrees with the boy's homophobic mother: Paul didn't commit suicide. But, she clings to deep denial about her son's sexual orientation. Conversion therapy - interventions to create ex-gays - get the once over in this Strachey mystery, and it ain't a pretty sight. (Don't let the HereTV adaptation of this story put you off this title.)
(Originally aired on HereTV; originally published 1995.)