Only an elite few are legally permitted to study the science of magic—so when Ash is rejected by Lancaster College of Alchemic Science, he takes a job as the school’s groundskeeper instead, forced to learn alchemy in secret. When he’s discovered by the condescending and brilliant apprentice Ramsay Thorne, Ash is sure he's about to be arrested—but instead of calling the reds, Ramsay surprises Ash by making him an offer: Ramsay will keep Ash's secret if he helps her find the legendary Book of Source, a sacred text that gives its reader extraordinary power.

Kadou, the shy prince of Arasht, finds himself at odds with one of the most powerful ambassadors at court - the body-father of the queen's new child—in an altercation that results in his humiliation. To prove his loyalty to the queen, his sister, Kadou takes responsibility for the investigation of a break-in at one of their guilds, with the help of his newly appointed bodyguard, the coldly handsome Evemer, who seems to tolerate him at best.

Inesa lives with her brother in a half-sunken town where they scrape by running a taxidermy shop. Unbeknownst to Inesa, their cruel and indolent mother has accrued an enormous debt—enough to qualify one of her children for Caerus’s livestreamed assassination spectacle: the Lamb’s Gauntlet. Melinoë is a Caerus assassin, trained to track and kill the sacrificial Lambs. The product of neural reconditioning and physiological alteration, she is a living weapon, known for her cold brutality and deadly beauty.

Sixteen-year-old dock boy Will is on the run, pursued by the men who killed his mother. Then an old servant tells him of his destiny to fight beside the Stewards, who have sworn to protect humanity if the Dark King ever returns. Will is thrust into a world of magic, where he starts training for a vital role in the oncoming battle against the Dark. As London is threatened and old enmities are awakened, Will must stand with the last heroes of the Light to prevent the fate that destroyed their world from returning to destroy his own.

Yetu holds the memories for her people - water-dwelling descendants of pregnant African slave women thrown overboard by slave owners - who live idyllic lives in the deep. Their past, too traumatic to be remembered regularly, is forgotten by everyone, save one - the historian. This demanding role has been bestowed on Yetu. Yetu remembers for everyone, and the memories, painful and wonderful, traumatic and terrible and miraculous, are destroying her. And so, she flees to the surface, escaping the memories, the expectations, and the responsibilities.