"Harrow the Ninth" is a fantasy novel by Tamsyn Muir, the second book in the Locked Tomb series. It follows the story of Harrowhark Nonagesimus, a necromancer, as she navigates a complex world filled with political intrigue, magic, and the aftermath of a devastating event. The narrative blends elements of horror and dark humor, creating a unique atmosphere. The novel explores themes of loyalty, identity, and the consequences of power. As Harrow grapples with her past and the challenges of her present, readers are introduced to a rich cast of characters and a vividly imagined universe that expands upon the foundations laid in the first book, Gideon the Ninth.