According to others, Kate Cahill and her sisters are eccentric girls. Too pretty, too fond of privacy and much more educated than is customary in their circles. But in reality it's even worse: they are witches. And if the monks from the powerful Brotherhood become aware of this, then the sisters will face either a mental asylum, a floating prison, or even a grave. One day, Kate finds her mother's diary and learns a fatal secret that could lead to the death of her entire family. Wanting to avoid a terrible fate, Kate begins to study forbidden books and makes acquaintances with dubious people, and all this at the same time with social receptions, shocking marriage proposals and a secret affair with a completely unsuitable young man for a husband. But if everything written in their mother’s diary is true, then the Cahill sisters are in danger, and the source of this danger is in themselves. A magnificent novel about witchcraft, witches and love!