Science Fiction
Nightside on Callisto
by Linda Nagata
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.
Best of the Year Illustrated by Galen Dara Reprinted in Gardner Dozois's The Year's Best Science Fiction