Linda Nagata | Nightside on Callisto

A faint, steady vibration carried through the igloo’s massive ice walls—a vibration that shouldn’t have been there. Jayne heard it in her sleep. Age had not dulled her soldier’s reflexes, honed by decades spent on watch against incursions of the Red. Her eyes snapped open. She held her breath. The vibration hummed in the walls, in the bed frame, in the mattress, perceivable even over Carly’s raspy breathing. Narrated by Hillary Huber.