] As with all good ideas, this one began in the pub. The
] idea was simple: I would leave a message in a Dead Letter
] Box, somewhere in London, and then provide clues to the
] other two until they found it. The turn would then move
] on. All very simple and innocent and more or less
] straight out of the Usbourne Spy's Guidebook. The only
] thing I had to do was to find a suitable Dead Letter Box,
] and compose the message to be hidden. Easy Peasy, lemon
] squeezy.

Fun story.