Doctor Walden is the Director of Magic at Chetwood School and one of the most powerful magicians in England. Her days consist of meetings, teaching A-Level Invocation to four talented, chaotic sixth formers, more meetings, and securing the school's boundaries from demonic incursions. Walden is good at her job --- no, Walden is great at her job. But demons are masters of manipulation. It’s her responsibility to keep her school with its 600 students and centuries-old legacy safe. And it’s possible the entity that Walden most needs to keep her school safe from…is herself.

Since she was born, Kyr has trained for the day she can avenge the murder of planet Earth. Raised in the bowels of Gaea Station alongside the last scraps of humanity, she readies herself to face the Wisdom, the powerful, reality-shaping weapon that gave the majoda their victory over humanity. Kyr is one of the best warriors of her generation, the sword of a dead planet. When Command assigns her brother to certain death and relegates her to Nursery to bear sons until she dies trying, she knows she must take humanity's revenge into her own hands. Alongside her brother’s brilliant but seditious friend and a lonely, captive alien, Kyr escapes from everything she’s known into a universe far more complicated than she was taught and far more wondrous than she could have imagined.