Magic does not always protect its owner. And the world where Marit lives is proof of this. To wield magical power in Denmark in 1866 was not a privilege, but a curse. Each new spell leaves the dangerous substance Firn in the veins of the magicians, bringing them closer to death. Firn killed Sister Marit, after which she swore never to use her thread magic. But when her close friend is adopted by the influential Westergard family, the girl is ready to do anything to stay close. She decides to take a chance and uses magic to get a job as a seamstress in their house. But Marit has something else in common with the Westergard family. Her father died working in their gemstone mines. And everything indicates that it was not an accident. The closer the girl gets to unraveling the secrets of this influential family, the more her loved ones are in danger. Marit finds herself at the center of a treacherous deception that reaches the King of Denmark. And now magic is the only thing that can save her. If he doesn't kill you first.