All That Bleeds

Description for ALL THAT BLEEDS by Kimberly Frost:

As the last heiress of the House of North, Alissa knows that striking up a secret friendship with a half-vampire enforcer is dangerous, but Merrick is a temptation she can't resist. But when Alissa is kidnapped, Merrick proves that he will do anything to protect the woman who tempts him with her very existence.

This is #1 in The Etherlin Series.