The Duke of Levansey’s intelligence service receives alarming information: in the county of Evendeyl, dangerous magical experiments are being carried out. Denisa and Teo, agents of the duke’s secret service, go to Evendeyl to find out who is conducting these experiments and for what purpose. Taking a job at the count’s castle, Denisa doesn’t yet know that she won’t be able to stay away from the internal affairs of his household for long. Soon, she will face a difficult choice. On one side of the scales—professional duty and loyalty to the duke; on the other—a feeling that flares up against her will.