Some time ago, I wrote myself into a corner in a chapter from Pantheon, in which a character was forced to solve a conundrum: he had to stay at a location, safeguard a highly sensitive museum, but prevent interlopers from coming inside, while not showing himself to them, or destroy them, or the critical objects of desire. The more I thought about this, the less confident I was at solving this Gordian knot. After all, if the aforementioned options prevented all possible solutions, then somewhere there was an assumption that made the conclusion false.