Sun Yunteng, deputy taxation department of the customs in the late Qing Dynasty, was proficient in foreign affairs and was impartial and impartial. While inspecting the cargo ship at Tianjin Port, he accidentally seized a batch of mysterious cultural relics from different ancient civilizations-Egyptian scarabs, Mayan crystal skulls, and Indian Shiva statues. These artifacts resonate with each other in the dark, quietly gathering together, pointing to the depths of the Forbidden City. When the British archaeologist Abbott demanded the goods in the name of scholarship and revealed the terrible plan for the night of the lunar eclipse, Sun Yunteng realized that an ancient ritual that could subvert the dynasty was brewing under the Forbidden City. He must rush into the forbidden land before the total lunar eclipse occurs, uncover the ancient mystery, and protect the final bottom line in the confrontation between civilization and barbarism.