"It's...hard to say."  He leans back in the tub and ponders.  "If I was a swarm of giant rats, I can't think of many better places to pillage.  If I was an intelligent<em>entity</em>of some kind, with a swarm of giant rats at my command, I'd probably be doing something else with them.  So, we should watch to see who benefits.  Is anyone else possessed of a supply of flour they can now sell at exorbitant rates?  If so, that's our rat-master."  He splashes water on his face, scrubs briefly, wipes it away.  "So, I suspect not.  It's just too convoluted.  And yet, there must be some cause..."  He takes a drink from his glass, swallows slowly.  "Even if that cause isn't an<em>intent.</em>"