Born among the hills of Scotland and raised on the Crusader tales of her grandfather, Murdo, and her father, Duncan, young Cait is determined to claim the Holy Cup for her own. Guided by a handful of clues from a stolen letter, Cait and a small band of knights follow a treacherous trail that leads from the shadowed halls of Saint Sophia into the heart of Moorish Spain and a world long unseen by Christian eyes.