There are a couple of posthumous Lord Peter Wimsey novels. The first was written from an unfinished manuscript of Sayers's. I don't know where the join is. The other was written from notes of hers. It's not as good, but it's still better than The Five Red Herrings.
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"