Fire of the Covenant
Book one of the Dragon-Called series.
Sixteen year old, Princess Willoe, is to be sent away, in seclusion, prior to the king marrying her off as a political necessity, rather than allowing her to fulfill her dreams of competing in a man’s world. Her twin, the solemn Prince Rowyn, has his own problems, forced to take up the life of a man-at-arms with men who show him no love, rather than fulfilling his dream of retreating into a life of study and contemplation. The twins decide, with the help of their cousins Aeron and Casandra, to take one last chance to experience their dreams.
A plan that has potential if not for two things: Foreign priests of the Shin-il Way, who see the twins as necessary to the priests' domination of the world; and the Burning Lady, goddess over the Spirit world, who requires that the twins fulfill a covenant that a distant ancestor of theirs had made with the king of the dragons.
The close family bond between the twins and their cousins can help them confront any danger, but the true test of this bond comes when the price of the covenant becomes clear.