In the Haunted halls of the Emperor's space station, Harrowhark Nonagesimus, last necromancer of the Ninth House, faces a grueling test. Tasked by the Emperor to fight a war that teeters on the edge of the impossible, Harrow struggles with waning health and an unreliable mind as she attempts to master the arts of undeath. Side-by-side with her sworn enemy, she confronts the looming specter of a ghostly planet, treacherous lessons, and the chilling possibility that her own life might be a detriment to the universe. 'Harrow the Ninth' unfolds as a mesmerizing saga of mystery, magic, and a woman's harrowing quest for survival against cosmic chaos.