The first vampire Marcus Corvinus was an all powerful ruler. But with royalty comes a price. His Queen Rosquaria gave birth to the first vampire children to ever be born. Circe, Deidre, and Eligia. They grew faster than normal and stopped aging after three years but they looked 16 and knew more than any other vampire could imagine. In effort to keep his daughters safe he hid them away and didn't allow anyone to come into the palace unless there was an occasion. For years they hid in the castle not knowing the outside world. Only knowing their guards and parents.
Triplets Abrim, Beau, and Claude Dythrune are the reigning heirs to the kingdom next to Marcus's. The princes knew that their maker was once friends with Marcus but someone tried to take the princesses for themselves causing the king to close the castle except for special occasions, and are told not to speak of what they have seen there or leave the ballroom. So their maker says. These three boys are determined to find out what's so secretive about the castle.