The second book in the HMRC trilogy opens with Niamh Kelly dead and her estranged twin, Ciara, secretly taking her place — poised to be crowned High Priestess of Her Majesty's Royal Coven. Suffering from amnesia and hiding what she's done, Ciara must fool Niamh's adopted family, the coven, and the Shadow Cabinet, a secretive branch of the civil service already suspicious of witches.
As Ciara tries to piece together her past, it catches up with her in the form of her former lover, the renegade warlock Dabney Hale. Meanwhile Leonie Jackman tracks Hale across the world, following rumors that he is hunting a dark artifact tied to the upper reaches of the British government. The story widens the series beyond the coven itself into a shadow war between witches, warlocks, and the institutions that fear them.