In 1948, to secure victory in the Crossing-the-Yangtze Campaign and stabilize the newly-born people's regime, the Third Field Army selects outstanding officers to infiltrate Nanjing, the stronghold of Kuomintang rule. With strong support from the Nanjing underground organization of the Communist Party of China, they venture deep into the enemy's lair, engaging in a life-and-death struggle of wits and prowess against the Kuomintang reactionaries.