He lined up at the Emperor's call.

He brought with him all his knowledge, courage and his only friend.

He won, and his triumph destroyed his world.

Harrowhark summons Nonagesimus, the last necromancer of the Ninth House, to wage an unwinnable war on his Emperor. At the side of his hated rival, Harrow must perfect his skills to become an Angel of Immortality - while on a killing spree, the sight of his sword makes him sick, and even his own mind seems to betray him.

Locked within the gothically gloomy walls of the Emperor's space station with three harsh teachers and the deranged specter of a slaughtered planet in his corner, Harrow must find answers to two dark questions. Is someone trying to kill you? And if it succeeds, will the universe really be a better place?

After rocking the universe with her stunning debut novel, Tamsyn Muir continues the story of the shadowy Ninth House with Harrow, the Ninth, full of mystery and murder, magic and bloodshed. In the halls of the Emperor, nothing is what it seems, even though the fate of the galaxy rests on the fragile shoulders of a single girl.