Carrier of the Mark, book 1Leigh Fallon2011

Their love was meant to be. When Megan Rosenberg moves to Ireland, everything in her life seems to fall into place. After growing up in America, she's surprised to find herself feeling at home in her new school. She connects with a group of friends, and she is instantly drawn to darkly handsome Adam DeRÍs. But Megan is about to discover that her feelings for Adam are tied to a fate that was sealed long ago—and that the passion and power that brought them together could be their ultimate destruction.