what happened to Sun Tzu?

There are some Sherlock Holmes fans even in my little city. I was forced to google #believeinsherlock, apparently a worldwide campaign, after finding little post-it notes here and there. This one was stuck to the cover of a book I happened to pull out from the shelf of a bookshop. (I'm not sure how Holmes and Watson felt about Sun Tzu?)

I am ever the fan of underground movements and bohemian campaigns, little assaults on the commonplace. Not to mention the feeling that this backwater town is somehow connected to the rest of the world.