This illustration, by the well-known DeAlton Valentine, was commissioned for a magazine advertisement. It was promoting a book, and your task, dear readers, is to guess what book. Dr. Boli will give you the hint that it was a very popular book by a very famous author; and, if it helps, he will even reveal the headline of the advertisement:

Akhn-Aton was human

Can you guess, without going to the Wikimedia Commons page where the image is hosted (because that will give away the source, of course) or resorting to Google’s massive artificial-intelligence empire, what book this image was advertising?