It is a good story because the producers have earned it.
Hercule Poirot said something like “If he murdered once perhaps he would do it again.”
“I saw the pictures of the cut up body,” she (the judge) said. “That body was cut up like it had been done by a surgeon. He knew what sort of tool to use for this bone and that muscle. It would have been impossible for someone to do that if it was their first murder attempt. That is a cold, calculating act.”
As is so often the case, he couldn’t leave it alone. He should have left the country when he had a chance. Did I write that? It seems we should be pleased he is in jail.