The Roman Hat Mystery

In the late 1920s men still wore top hats for formal affairs. A death occurs in the Roman Theater and inexplicably, the murder victim's top hat is missing. The Roman Hat Mystery is structured as a logical, deductive challenge to the reader. A list of characters and a floor plan of the Roman Theater are provided. Prior to the final chapter, the reader is informed that Ellery has solved the mystery, and the alert reader should have noted the critical clues. I was not particularly successful. Queen's detailed explanation is about twenty pages; the logic is convincing.