The Case of the Vanishing Stagehand

Avon (no-number #4)

It's difficult to decipher Avon printing numbers. They're never listed, and while some people have determined how to figure out first printings by the books' end papers, later printings are usually a mystery. (Neither of these is a first.)

And speaking of mysteries ... Where did he go? And why?

Sorry, I don't have the answers.