SOME WITCHES CAST SPELLS, OTHERS SLAY KINGS. A mysterious Grimoire. A marriage full of dark secrets. A History sculpted by a quartet of Sister witches. For three hundred years, Sister Autumn has incited wars, burnt villages, killed kings, and released plagues at the bidding of the Grimoire. Meanwhile, her Sister Winter, Sister Spring, and Sister Summer have brought forth only peace. When an Order from the Grimoire sends Agatha to the Kingdom of Merveille, she already anticipates the worst. Unless she wants to face the wrath of the Goddess, Agatha must keep her head down and do as she's commanded. But when the Grimoire Orders her to marry a pompous prince and play the role of a peasant "accepted" by vicious aristocrats, she finds herself at the center of a war between the classes and an age-old prophecy. Within the court, many players harbor dark secrets-including her new husband. With her newfound influence, Agatha joins forces with the city's Blacklisted in order to blur the lines between the common man and the elite, unravel the mysteries in her marriage, and decide once and for all if she will defy the Grimoire and face the brutal consequences. As secrets unfold, will Agatha continue to slay on behalf of the Grimoire, or forge an uncharted History with her unlikely allies?

Some witches cast spells. Others sacrifice everything. A Sister forced to do the unthinkable. A kingdom on the brink. A quartet of witches intent on altering History. For centuries, Sister Winter’s life has been dictated by a Grimoire—the Book her Sister Autumn just destroyed. Despite the necessity of its destruction to end a vile shadow organization and the Sisters’ three hundred years of separation, Wendolyn is left adrift without its guidance. As secrets from long ago begin to rise up around her, Sister Winter must face what haunts her, while the Prince of Mereville uses his abilities as Marchand de Mort to infiltrate The Order—the shadow regime that wants him dead. Will the ghosts of the past keep Wendolyn from her Sisters? Will their differences spell the end for Midlerea? Or can they put aside what’s been to save the dark prince and the future of the realm?

"There was nothing like the buzz of poison and murder in her veins." -Sorscha As the Joubert Sisters navigate a world of impending war without their full magic, the Prince of Bone fights for his life—torn between the land of the living and the land of the dead—only to discover the Court of Achlys means more to him than he ever knew. Agatha untangles the prophecy that set their realm aflame. Winnie and the Druids prepare for war. Seleste faces physical setbacks in a foreign land. And Sorscha? Ah, Sorscha and her sass discover secrets in the catacombs of Araignée.