OCD SOTD - De-cipher this enigma

"Once upon a perfect night, unclouded and still, there came the face of a pale and beautiful lady. The tresses of her hair reached out to make the constellations, and the dewy vapours of her gown fell soft upon the land."

Although these words weren't written about Elonka Dunin I am sure she understands the reference. However, suffice it to say, Elonka has a cryptic problem and she isn't keeping it a secret.

DaVinci Coder Dan Brown has alluded to, and is basing the third book of his 'trilogy' on, it. Supposedly only three people know the solution although the artist says the other two were given false information. Only those within the CIA or their special guests can even see what I'm talking about.

So you're wondering why I would bother bringing this to your attention? For a simple reason. Elonka is a lovely woman but she is clearly obsessed with solving Kryptos and must compulsively post about it on the web. Why else would she be today's OCD SOTD?

BTW the quote is from Kit Williams' Masquerade

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As of post time I'm listening to She Has No Time from the album "Hopes And Fears" by Keane