In the kingdom of Kaleria, for ten years now there has been a struggle for power between the gentle, good-natured ruler and his younger brother, who is more successful in business. Many people predict the throne for Prince Carlos. After all, the king has no heir. In the capital, Fiala, they fear the possibility of a coup. During this turbulent time, Izhenie Cavelier, the daughter of one of the conspirators, is given in marriage to Regis de Baccard, an officer of the king's secret police. He must uncover the conspiracy. She dreams of achieving his love, and at the same time protecting her father from the suspicions of the police. The fate of the kingdom depends on which of them achieves their goal.