"I could summon a friendly ghost to eat you." snarked Joy in Ben s direction. "If you have nothing useful to say, you could at least shut up."
Carefully, Joy walked to a wall and started gently knocking against them. Maybe there really were some passages, although she doubted it.
If not, they would have to use a chair or whatever to break the door open. In modern schools, a kick was enough to break a wall, however, this one was rather old.