The corridor they're in opens out into a hallway about the size of Dinah's living room at home, with a very obvious trapdoor on the floor, and a very obvious triangle on that door.

Only the room looks smaller because it's almost entirely taken up by three large - no one large dog with three enormous heads, fast asleep and snoring, a paw resting on the trapdoor.

Dinah pauses, then relaxes, breathing out in a sigh of relief.

"Oh, thank god.

"Okay, I got this. You ready to get to the door?"