The "Locked Tomb" series, written by Tamsyn Muir, is a blend of science fiction and fantasy that follows the story of Gideon Nav and Harrowhark Nonagesimus. Set in a universe where necromancy and swordplay coexist, the narrative explores themes of identity, power, and love against a backdrop of complex world-building. The series begins with "Gideon the Ninth," where Gideon is drawn into a deadly competition among necromancers. As the plot unfolds, readers encounter a rich cast of characters and intricate relationships, leading to unexpected twists and revelations about the nature of life and death in this unique universe.