Pandora Small has two ruling objectives: first, to keep the prodigious extent of her power secret, in a world where mages are feared and governed by suffocating laws. Second, to find her wealthy and noble-born patron, a shadowy figure bound to Pandora by magic, who stole her childhood and grew her power until she became a weapon rather than a girl. To that end, she’s posing as an Ingenue, a privileged and petted young woman of strictly limited abilities, who is allowed access to the royal court’s social season in order to find a husband and patron to control her magic.

But on Pandora’s arrival at court, Kit Beacon, one of the most promising members of the Royal Guard, inadvertently learns the true scope of her power. Privately sympathetic towards mages and the difficulties they face, Beacon decides to keep Pandora’s secret. But when someone or something with powers terribly like Pandora’s own begins slaughtering her fellow Ingenues, Beacon’s resolve to keep what he knows about her private is put to the test.

Tasked with protecting all the girls in the palace, not just one, Beacon will have to decide whether Pandora is a suspect or an ally, while to win his trust, Pandora will have to let him know more of her still—the worst of who she is and what she’s done. Because only unity between them during the social whirlwind to come will enable Pan to find her patron and Beacon the killer, and ensure they both see justice meted out.