"Ah, bravo. Eureka. Now--if we can only find a table to spread these out on, see if I can match them up... It really is a warren down here, isn't it." Even the lighting seems different in this part of the downstairs; and when did they last see a customer or a shopkeeper?

Maybe he should break out one of his balls of thread after all. Or at least put his head through one of these doors and see if it turns out to be a staircase.