"Nona the Ninth" is a fantasy novel by Tamsyn Muir, part of the Locked Tomb series. It follows the story of Nona, a young girl with a mysterious past, as she navigates a world filled with necromancy, political intrigue, and complex relationships. The narrative blends elements of humor, horror, and adventure, making it a unique addition to the genre. Set in a universe where the dead can be raised and the living are often entangled in their fates, "Nona the Ninth" explores themes of identity, loyalty, and the consequences of power. The book continues to develop the intricate lore established in previous installments, engaging readers with its rich character development and imaginative world-building.