Seen - Heartstone, #2

Shayd's visions serve the Heart... until it asks him to betray his own future. When the Shrouded Heart sends him on a mission of diplomacy, Shayd is eager to obey. The treason of his predecessor has stained the rituals and weakened his relationship with the sacred crystal, but when it brings him to Rowri, he is certain the alien priestess is destined to be his heartmate. Despite the fact that their mission is to deliver her to her wedding...
to someone else. Rowri's duty to her people insists Shayd must give her away, even as their heartbond draws them closer and closer together. Though he understands her loyalty, honoring her choice will put her in danger, leave her planet open to attack, and unleash an old enemy dead set on destroying them all.