The concluding volume of the HMRC trilogy finds Her Majesty's Royal Coven in ruins and the world's fate hanging on five very different witches — Niamh, Ciara, Leonie, Elle, and the fledgling witch Theo — who find themselves at the center of a prophecy engineered by Lucifer, the demon king of desire. Niamh has returned from the dead, but not alone; Ciara is imprisoned; Elle grieves a son she never had; and Leonie faces an unexpected reckoning of her own.
Lucifer offers Theo a devil's bargain: help him and her coven will be spared. As the demon Satanis threatens to rise, the witches of Hebden Bridge must decide how far they'll go, and what they're willing to sacrifice, to stop an apocalypse and save what's left of their found family.