Kingmaker(Dragon Corsairs‪)‬

From New York Times bestselling author and leading fantasists Margaret Weis and Robert Krammes comes Kingmaker, the thrilling conclusion to the swashbuckling Dragon Corsairs series.
In this exciting adventure, Kate and Sophia and their dragon Dalgren form a desperate plan to free Phillip from prison. Thomas is crowned king and discovers a plot by King Ullr to invade Freya. And Henry is forced to flee to the Aligoes where he makes a discovery that could change the fortunes of his beleaguered nation.