One of the advantages of being a fairly public person (having written a book and having a popular-ish blog) is that I have a small coterie of regular correspondents who send me interesting links and thoughts. One of these is a gentleman who sent me a copy of Leo Marks' Between Silk and Cyanide as a gift.
Along with the book came a cryptic note that there was an unsolved mystery in the book. Later I asked him about the mystery which turns out to be this passage:
Any clever thoughts?
PS The only thing I got reminded of was this paper: Passwords you’ll never forget, but can’t recall. Perhaps PANDARUS took a photograph (or many photograph) and showed it (them) to MANELAUS. One would have meaning to MANELAUS but not the others, to PANDARUS none would have meaning.