"Everything is backwards! Everything. Not just one movable object, mind you, or two or three, but everything. There's your rhyme. But how," he muttered, beginning to stride about again, "how about the reason? Why should everything have been turned backwards? What is it intended to convey, if it's intended to convey anything at all? Why, Brummer; eh?"
"I don't know," said the detective in a hushed voice. "I don't know, Mr. Queen."
Ellery paused in his stride to stare at him. Nye slumped against the door in attitude of complete befuddlement. "Nor do I, Brummer," said Ellery from behind clenched teeth, "yet."
(from The Chinese Orange Mystery, by Ellery Queen)