Gideon Nav has had enough of the Ninth House — a decaying, gothic world of skeletons, secrets, and endless servitude. Raised among nuns and necromancers, she wants nothing more than to escape her coffin-like planet and join the Imperial army. But when her nemesis, Harrowhark Nonagesimus, heir to the Ninth, is summoned to compete in a deadly trial of necromantic power, Gideon is dragged along as her sworn cavalier.

Together, they must face impossible puzzles, bone magic, and rival houses — all while uncovering the horrifying mystery buried at the heart of the Emperor’s immortal court. As allies turn to enemies and the dead refuse to stay buried, Gideon’s blade — and her irreverent humor — may be the only things keeping her alive.

Brilliantly original, darkly funny, and thrillingly strange, Gideon the Ninth combines sci-fi, fantasy, and mystery into a story about power, devotion, and the razor-thin line between love and destruction. Tamsyn Muir’s debut is a wild ride through death, desire, and defiance — unlike anything you’ve read before.