The Secret Talisman of Yongle

Lu Tianye, an expert in antique appraisal at the Palace Museum, receives the Dunhuang Star Chart left behind by his father and discovers that it is actually a coded sea chart drawn by Zheng He's fleet.

When he rushes to Dunhuang to rescue an archaeological team, they are attacked by international mercenaries. Before a teammate dies, they shout, “East China Sea.”

Using the star chart, Lu Tianye reconstructs the three-dimensional coordinates of the Mogao Caves and opens the entrance to the legendary “Yongle Underground Treasury.”