Is there a best or recommended book for this?
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I dunno about best, but the first book has the most normal environments, so if you want a modern setting to match the surveillance conspiracy vibe then I'd go with that. It should just be called "Where's Wally/Waldo" in stores, but make sure to get one that was printed in 1997 or later so it has all the characters (this is mainly an issue to be aware of if you're buying second-hand, I doubt anywhere's selling pre-1997 copies first-hand, but check just in case).