All very clever but deeply flawed. Would a woman stabbing a man with scissors really be able to kill him ? The penalty for murder was hanging which in these circumstances would be a big deterrent to killing someone. Why didn't Swann just kill Wendice once he tried to have blackmail him, rather than go through all that palaver to kill his wife ? Of course her ex lover would want to save Mrs Wendice but really would he have concocted the story to save her ?