Peter does what Peter does – what a golden age detective does – and tootles off into the sunset, crime and victim(s) slotted in as just another pretty puzzle, just another story.

I disagree with this, and will talk to you about why once you have finished the rest of the Wimsey-Vane books!

ETA: I think you can disagree based only of the text of Have His Carcase without bringing in future knowledge. I just don't trust myself not to accidentally bring in spoilers for you.