Interesting point. I recall reading that Unpleasantness was also one that Sayers herself was not happy with, what with the induced confession, followed by suicide. That later, she wasn't pleased that that's the way she had it play out.

But your observations intrigue me. I think it explains why I like P.D. James. The people in her stories are intriguing as personalities. The first book of hers that I read was Death of an Expert Witness, and the way people reacted to Dalglish interested me.

I'll have to go think about this some more.