Excalibur Rising: Book Two — Eileen Enwright Hodgetts

When a peasant boy finds a hoard of alien coins he begins a journey that will change the future of Camelot. In Book Two of Excalibur Rising, Violet and Ryan are trapped in Albion while King Arthur faces defeat at the hands of Mordred. The peasant boy's coins offer them the hope of returning home but they cannot leave while Camelot is besieged and Arthur needs their help to put the true heir on the throne. Magic will fail, courage will be tested, love will blossom, and Excalibur will reveal the dreadful truth behind the legend.