Molly Gray is not like everyone else. She struggles with social skills and misreads the intentions of others. Her gran used to interpret the world for her, codifying it into simple rules that Molly could live by. Since Gran died a few months ago, twenty-five-year-old Molly has been navigating life’s complexities all by herself. No matter—she throws herself with gusto into her work as a hotel maid. Her unique character, along with her obsessive love of cleaning and proper etiquette, make her an ideal fit for the job.

Several weeks ago, Chief Inspector Armand Gamache of the Sûreté du Québec and his team uncovered and stopped a domestic terrorist attack in Montréal, arresting the person behind it. A man they called the Black Wolf. But their relief is short-lived. In a sickening turn of events, Gamache has realized that plot, as horrific as it was, was just the beginning. Perhaps even a deliberate misdirection. One he fell into. Something deeper and darker, more damaging, is planned. Did he in fact arrest the Black Wolf, or are they still out there?

Lady Emily Hardcastle is an eccentric widow with a secret past. Florence Armstrong, her maid and confidante, is an expert in martial arts. The year is 1908 and they've just moved from London to the country, hoping for a quiet life. But it is not long before Lady Hardcastle is forced out of her self-imposed retirement. There's a dead body in the woods, and the police are on the wrong scent. Lady Hardcastle makes some enquiries of her own, and it seems she knows a surprising amount about crime investigation...

London, 1930. The five greatest women crime writers have banded together to form a secret society with a single goal: to show they are no longer willing to be treated as second class citizens by their male counterparts in the legendary Detection Club. Led by the formidable Dorothy L. Sayers, the group includes Agatha Christie, Ngaio Marsh, Margery Allingham and Baroness Emma Orczy. They call themselves the Queens of Crime. Their plan? Solve an actual murder, that of a young woman found strangled in a park in France.

After more than a year of laying low, Billie, Helen, Mary Alice, and Natalie are called back into action. They have enjoyed their time off, but the lack of excitement is starting to chafe: a professional killer can only take so many watercolor classes and yoga sessions without itching to strangle someone...literally. When they receive a call from the head of the elite assassin organization known as the Museum, they are ready tackle the greatest challenge of their careers.