Kell is one of the last Antari—magicians with a rare, coveted ability to travel between parallel Londons; Red, Grey, White, and, once upon a time, Black. Kell was raised in Arnes—Red London—and officially serves the Maresh Empire as an ambassador, traveling between the frequent bloody regime changes in White London and the court of George III in the dullest of Londons, the one without any magic left to see. Unofficially, Kell is a smuggler, servicing people willing to pay for even the smallest glimpses of a world they'll never see. It's a defiant hobby with dangerous consequences, which Kell is now seeing firsthand. After an exchange goes awry, Kell escapes to Grey London and runs into Delilah Bard, a cut-purse with lofty aspirations. She first robs him, then saves him from a deadly enemy, and finally forces Kell to spirit her to another world for a proper adventure. Now perilous magic is afoot, and treachery lurks at every turn. To save all of the worlds, they'll first need to stay alive.

When Rin aced the Keju — the Empire-wide test to find the most talented youth to learn at the Academies — it was a shock to everyone: to the test officials, who couldn’t believe a war orphan from Rooster Province could pass without cheating; to Rin’s guardians, who believed they’d finally be able to marry her off and further their criminal enterprise; and to Rin herself, who realized she was finally free of the servitude and despair that had made up her daily existence. That she got into Sinegard — the most elite military school in Nikan — was even more surprising. But surprises aren’t always good. Because being a dark-skinned peasant girl from the south is not an easy thing at Sinegard. Targeted from the outset by rival classmates for her color, poverty, and gender, Rin discovers she possesses a lethal, unearthly power — an aptitude for the nearly-mythical art of shamanism. Exploring the depths of her gift with the help of a seemingly insane teacher and psychoactive substances, Rin learns that gods long thought dead are very much alive — and that mastering control over those powers could mean more than just surviving school. For while the Nikara Empire is at peace, the Federation of Mugen still lurks across a narrow sea. The militarily advanced Federation occupied Nikan for decades after the First Poppy War, and only barely lost the continent in the Second. And while most of the people are complacent to go about their lives, a few are aware that a Third Poppy War is just a spark away. Rin’s shamanic powers may be the only way to save her people. But as she finds out more about the god that has chosen her, the vengeful Phoenix, she fears that winning the war may cost her humanity ... and that it may already be too late.