Black Dawn (Night World #8)

First he puts her in a dungeon. Then he realized they were soulmates. Now he wants to make her a vampire princess. Maggie Neely is a short, spunky sixteen-year-old with auburn hair and an iron will. When he brother turns up missing, she's determined to find him. But she never suspects that the trail will lead her into the most secret heart of the Night World, a kingdom where no outsider has stepped in five hundred years.