The Case of the Two-Headed Idiot (The Screwball Circus Mysteries, Vol. 10), by Harry Stephen Keeler (epub/Kindle/pdf)
"My guiltiest pleasure is Harry Stephen Keeler. He may been the greatest bad writer America has ever produced. Or perhaps the worst great writer. I do not know. There are few faults you can accuse him of that he is not guilty of. But I love him." -- Neil Gaiman
What would you do if you were Angus MacWhorter, owner of the Biggest Little Circus on Earth, and you’d been offered $3000 for just ten minutes alone with the two-headed child who at one time was the star feature of the circus? Why, you'd send your right hand man, Brock Colburn, to Chicago to check up on the offering party. The trouble is, Brock is wanted in Chitown for an old felony he didn't commit, and any sleuthing he does is going to have to be under deep cover. If only Brock could meet some sympathetic person who could help him, someone like Ardis Waring -- Mrs. Ardis Waring. And let's not even mention the Chinese laundryman known as Ah Hell. Yes, Ah Hell. Let’s don't mention him.