The Esther Repellant
A odd and menacing story-like bit spun off from Marcus' forthcoming novel, The Flame Alphabet.
"To warn me of Esther’s approach, or indeed of the motion of any living creature through our halls and rooms, I rigged a system of alarms that puzzled into the wall switch plates. But I crossed the wiring or somehow failed to close the circuit for this contraption, because the high siren pierced the air even when no one roamed through."