Miss Elizabeth Knight received an unexpected legacy upon her uncle's death: a collection of occult books. When one of the books begins talking to her, she discovers an entire world of female occultist history opened to her—a legacy the Royal Occult Society had purposely hidden from the world.

However, the magic allowing the book to speak to Miss Knight is fading and she must gather a group of female acquaintances of various talents. Together, they'll need to work to overcome social pressures, ambitious men, and tyrannical parents, all to bring Mrs. Egerton, the book ghost, back.