Hidden among us, book 1Katy Moran2013

When Lissy meets a mysterious and strangely beautiful boy on her way to Hopesay Edge, she is deeply unsettled by their encounter. She discovers that the boy, Larkspur, is a member of the Hidden, an ancient group of elven people, whose secrets lie buried at Hopesay Reach. Before long, Lissy and her brother Rafe find themselves caught by a powerful magic and fighting to escape a bargain that can never be broken.