Zhou Ruosi was a graduate of Peking University and was working in The Palace Museum. Once, she exposed the fraud of a dishonest trader and almost got herself killed. Ren Hongyi, a military instructor who was the son of the teacher of Zhou saved her. He was asked by the police commissioner Wang Liwen to help with a case. The suspect killed the victim and took the important cultural relic from him. Ren found that the way the suspect kills was an assassination skill that is using by the Japanese Spies. It was likely that the killer was Honda Kita, the schoolmate of Ren in Japan. Also, the people in charge of the Chinese cultural relics stuff are discussing how to protect the cultural relics in The Palace Museum during the war. They were planning to transfer these national treasures to a safer place.