After the leader of Qingdao CPC was trapped by enemy, a new leader comes. He makes efforts to save the predecessor and find out the traitor.

In autumn 1948, during the Huaihai Campaign, Xie Yanfei, a reconnaissance chief, infiltrated Hekou City with driver Xiao Wang, using Lou A’mei as cover. Discovering the local Party organization was compromised, he sought his childhood sweetheart, Xia Cailian, who had joined the enemy’s service corps. They met secretly at Lou A’mei’s, but the enemy grew suspicious. After a firefight, Xie was wounded, and Xiao sacrificed himself. Xie escaped into a lake and was rescued by Xia Cailian, who recognized him as her former lover. Despite their past, Xie maintained secrecy and left without revealing their identities.

Police attempt to stop Nationalist agents from destroying public buildings in Ruancheng after the Red Army occupies the city.