The second installment in Muir's Locked Tomb Trilogy, continues the cosmic adventures, this time focusing on Harrowhark Nonagesimus, the sole surviving necromancer of the Ninth House. Harrow is now a Lyctor, serving the undying Emperor of the Dominicus system in a celestial war that defies the boundaries of death and reality. But her transformation isn't going according to plan. Haunted by specters from her past, losing grip on her own mind, and grappling with a lingering bond with the departed Gideon, Harrow must unravel a tangled mystery that spans eons and confront a threat that could consume all existence.

Revolves around Kira Navárez, a xenobiologist stationed on a distant planet. On what was supposed to be a routine mission, Kira stumbles upon an alien relic that thrusts her into the midst of an interstellar war. The story unfolds as Kira grapples with the relic's transformative powers and faces enormous threats that endanger not only her life but the entire human civilization. Along with a memorable ensemble cast, Kira must navigate a web of cosmic secrets, political intrigue, and dangerous encounters to ensure humanity's survival.