Summer of the Moon Flower — Annie Seaton

Sofia de Vargas' research into the Alpine Moon flower and its elixir of immortality will threaten the very existence of an ancient Scottish order. Dougal, the Earl of Rothmore must prove his loyalty to his masters, the Knights Templar, and bring her body back to Kilmarnock.
Sofia is kidnapped and imprisoned on the isolated Isle of Rothmore. Is Dougal her sworn enemy...or her saviour?