"I may need it if it gets bad enough," Stephen said, perfectly serious although it was ruined by his grin.
"Word of mouth mostly," he said, trying to remember where they were. It was much easier to remember they were there as he passed them, much like the trick stairs. "I'm sure there's others I don't know about. I heard there are heaps that actually go out of the castle too. They're very handy when you're running late for a class."