Here's the link from wiki that explains more about Captain William Morgan. The link for "Ethidorhpa," is within. Spelt backward it's Aphrodite. He was kidnapped on September 11th, in upstate NY in 1826 and disappeared. There was a monument erected in his honor years later. He felt compelled to reveal secrets of the Mason's due to a mysterious letter he had received in the mail. The audio-book is good, but of course the book is better.