As the Mongol hordes stand at the gates of Koryo, general Sali Tayi issues an ultimatum: surrender and serve the Empire, or die by the hands of the Mongol army. When Koryo refuses, the invasion begins!Based on the historical 13th-century conflict between ancient Korea and the sons of Genghis Khan, Threads of Time plunges into the thick of battle--where valor, honor, deceit and betrayal sound furiously in the echoes of war drums.