I’m not a big fan of this book indeed of the whole of the Lord Peter Wimsey series. It’s a bit too much like Bertie Wooster being a detective, with a similar background of wealthy people, privilege, and well-connected friends.
The actual murder is contrived as is the way the body is placed where it’s found. I don’t understand why a murderer would go to all the trouble, carrying a dead body over rooftops, and placing it in someone’s bathroom via a window. Also, the murderer must have had superhuman strength and nimbleness to do this.
The confession at the end just covers up that no one would be able to deduce how this murder was committed – getting the murderer to explain their modus operandi is a lazy way of writing