And if she can figure out how to do this with email we'll all be saved

“Prisoners, Lovers, And Spies:” The Story Of Invisible Ink From Herodotus To al Qaeda | Fortuna's Corner

"‘She has cast a wide research net,’ Mr. Goulden adds, ‘trolling up likely evidence not only in intelligence archives, but also in literature."

(You may find his on the book list at some future date.)