"One would guess we do," he says, sounding distracted. It's sufficient enough that he looks from the fingerprints to gaze around the room, looking for anything else obviously dirt touched.

Wet, yes, but not soiled. Moulding, yes, but not dirtied.

He hums a note of consideration.

"Karsa needs to know the gateway is intact. We need to ask after what else might have changed here recently, if the people can even remember."