A King's Radiance

Three siblings… a rebel, a prince, a prisoner
The sun’s light shines bright over the land of Zapour, and only a select few can harness its power. But all power comes with a cost, and the world is not kind to those who refuse to pay it.
Raiz Glaive, a strong shine wielder, was born into royalty, though even royals have to answer to someone. When the King-Radiant sends one of his precious underlings to the Kingdom of Trost, Raiz quickly learns who holds the true power in the realm. After his sister is taken prisoner simply for having the violet eyes of a mystic, Raiz swears vengeance. But when an unwilling father stands in his way, Raiz promises to take revenge into his own hands.
Dazen Glaive remains heir to the throne of Trost, and a sworn defender of the King-Radiant, but he has not forgotten what happened to his sister, and will not forgive their cruelty.
Forced to be the centrepiece of her “master’s” twisted human art gallery, Isha remains a prisoner. Though she has not lost hope. Finding friends among fellow captives, she begins to formulate a plan for escape. Though what she discovers has a much more sinister bearing on the fate of all of Zapour.