After unwittingly helping her mother poison King Louis XIV, seventeen-year-old alchemist Mirabelle Monvoisin is forced to see her mother’s Shadow Society in a horrifying new light: they’re not heroes of the people, as they’ve all the time claimed to be, but murderers. Herself included. Mira tries to ease her guilt by brewing helpful curatives, but her hunger tonics and headache remedies can’t right past wrongs or save the dissenters her mother vows to purge.
Royal bastard Josse de Bourbon is more kitchen boy than fils de France. But if the Sun King and half the royal court perish by the hands of the Shadow Society, he will have to turn into the prince he was once never meant to be to be able to save his injured sisters and the petulant dauphin. Forced to hide in the sewers beneath the city, any hope of reclaiming Paris seems not possible―until Josse’s path collides with Mirabelle’s, and he finds a surprising ally in his sworn enemy.
She’s a deadly poisoner. He’s a bastard prince. Together, they form a tenuous pact to unite the commoners and former nobility against the Shadow Society. But can a insurrection built on mistrust ever hope to succeed?