To find Mio, you must first discover the 13 letters in this message. The message will tell you where you can find Mio. Once you know the full text of the message, you may enter it on the Message page (link).
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If you do not yet know the full text of the message, follow the rules in the “Finding Mio” (PDF) to look for clues about what might have happened to Mio. At the end of each game of Spy Club you play, you will have an opportunity to enter those clues here: