Every generation on Fennbirn Island, a set of royal triplets is born, three princesses, all equally heir to the crown. Each sister always possesses magic--Mirabella the elemental powers, Katharine with powers over poison, and Arsinoe who controls plants and animals. Becoming Queen Crowned is not as easy as being born, however--when they turn sixteen, the fight for the crown is on, and only one sister can win.