In the winter of 1948, the three major battles were in full swing, and the defeat of the Kuomintang army was unstoppable, and the Communist Party of China set up a special task force headed by Chai Fudong to secretly infiltrate Nanjing, hoping to rescue the geologist Jiang Qianli and use the hydrological map of the Yangtze River drawn by him to benefit the people. The two are both classmates and mortal enemies; Each led the team to fight to the death. The CCP special task force thwarted Ma Boju's conspiracy again and again, and finally completed the task after many dangers, not only sending Jiang Qianli safely to the liberated areas, but also snatching back the rare cultural relics of the Song Emperor's Mausoleum that had been stolen by the Kuomintang reactionaries and returning them to the people.