No Laughing Matter by Betty Rowlands
Two fatal cases of food poisoning at Framleigh House, the smart residential home where Melissa Craig's mother Sylvia is staying, are treated as accidental by the authorities.
To Melissa's consternation, Sylvia decides to do some detective work of her own: why do the once-married couple ignore one another in company but make a secret rendezvous in the grounds? Do the two gay actors fit into the puzzle? Can Sylvia trust the confidante whom she has roped into her 'investigation'?
When another resident is taken ill Melissa starts to take her mother's concerns seriously and begins to investigate with the aid of local journalist Bruce Ingram. And in so doing puts her own life in jeopardy.