Banner of the Damned — Sherwood Smith

Princess Lasva is about to be named heir to her childless sister, the queen. But, when the queen finally bears an heir, Lasva's future is shattered. Grief-stricken, she leaves her country of Colend and falls into the arms of Prince Ivandred of Marloven Hesea. His people are utterly different-with their expertise in riding, weaponry, and magic- and the two soon marry.

When the sensational news makes its way to Lasva's sister, the queen worries for Lasva at the hands of the Marlovens, whose king's mage is in league with the magical land of Norsunder-considered by Colendi to be their enemy. The queen orders Emras, a scribe, to guard Lasva.

But it may be too late-Lasva is already deeply involved with the Marlovens and their magic. War wages on, and all are forced to redefine love, loyalty, and power...