At the dawn of their adolescence, on the eve of the summer solstice, four young girls—Helena, Leonie, Niamh and Elle—took the oath to join Her Majesty's Royal Coven, established by Queen Elizabeth I as a covert government department. Now, decades later, the witch community is still reeling from a civil war and Helena is the reigning High Priestess of the organization. Yet Helena is the only one of her friend group still enmeshed in the stale bureaucracy of HMRC.

Cecilia Bassingwaite is the ideal Victorian lady. She's also a thief. Like the other members of the Wisteria Society crime sorority, she flies around England drinking tea, blackmailing friends, and acquiring treasure by interesting means. Sure, she has a dark and traumatic past and an overbearing aunt, but all things considered, it's a pleasant existence. Until the men show up.

All magic comes with a price, though, and for years the sisters have been separated. Esther has fled to a remote base in Antarctica to escape the fate that killed her own mother, and Joanna’s isolated herself in their family home in Vermont, devoting her life to the study of these cherished volumes. But after their father dies suddenly while reading a book Joanna has never seen before, the sisters must reunite to preserve their family legacy.

All Talasyn has ever known is the Hurricane Wars. Growing up an orphan in a nation under siege by the ruthless Night Emperor, she found her family among the soldiers who fight for freedom. But she is hiding a deadly secret: light magic courses through her veins, a blazing power believed to have been wiped out years ago that can cut through the Night Empire’s shadows.

Jonathan Forest should never have hired Sam. It was a sentimental decision, and Jonathan didn't get where he is by following his heart. Determined to set things right, Jonathan orders Sam down to London for a difficult talk…only for a panicking Sam to trip, bump his head, and maybe accidentally imply he doesn't remember anything?