Harrowhark Nonagesimus is a fictional character from the fantasy series titled The Locked Tomb by Tamsyn Muir. She is a powerful necromancer and a member of the Ninth House, known for her intelligence and cunning. Harrowhark is central to the story's exploration of themes like death, power, and identity. In the series, Harrowhark embarks on a journey filled with challenges and complex relationships, particularly with Gideon Nav, another key character. The narrative delves into her struggles with her past and her ambitions, making her a compelling figure in the world of necromancy and magic.