Podcast
RedHanded
In the episode the hosts referred to the book as an example of a classic murder mystery where a family is slain and the surviving son is revealed as the true culprit, contrasting the initial suspicion on the father. They mentioned it in passing while discussing similar plot twists, without offering a strong endorsement.
Episode: Episode 288 - Black Magic, Incest & Murder: The Ba...
It was mentioned as an Agatha Christie story where a family is murdered, the father is the main suspect, but the son is the real killer.
"
But one of the stories, Death of a Dolphin, tells the tale of a family who were murdered.
And this thought that David, the surviving son, could be the real killer and that he was just framing his father Robin, had of course occurred to the police.