In Shanghai in 1941, Sheng Huaiyuan, a military agent, was ordered to sneak into the Paramount Ballroom and use his identity as a musician to track down the Japanese spy codenamed Nightingale. Bai Lu, the top dancer at Paramount, was beautiful and enchanting, but she was actually an underground member of the Chinese Communist Party, who was also looking for Nightingale. The two had mutual suspicions when they first met, and there were hidden temptations in their verbal exchanges. Daisuke Sato, the head of the Japanese secret service, controlled the manager and set up a trap to trap the suspicious person. Member; Sheng Huaiyuan discovered a radio station hidden in a secret room during a late-night inspection and was almost exposed; Bai Lu noticed that Sheng Huaiyuan was acting abnormally and deliberately created an opportunity to dance together to obtain information. Unexpectedly, the two faked the show and were forced to join forces to deal with Sato's forced palace; Nightingale was about to deliver the poison gas plan drawings within three days, and all parties were secretly wrestling with each other; Sheng Huaiyuan's superior ordered him to approach Bai Lu to obtain intelligence, and Bai Lu received the team's The Weaving Order instigated a rebellion against Sheng Huaiyuan; during a joint operation, the two appeared at the same time, and their identities were ready to be revealed, but they chose silence in a tacit understanding; Sato organized a banquet at Hongmen, and Sheng Huaiyuan and Bai Lu co-acted a drunken farce to escape; the true identity of Nightingale emerged one after another - first pointing to the manager's cronies, and then to the newsboy, and finally revealed to be the most inconspicuous traitor translator around Sato; the location of the poison gas factory was confirmed, Sheng Huaiyuan Yuan and Bai Lu decided to risk the bombing; on the eve of the operation, the traitor was betrayed, Sheng Huaiyuan was arrested, and Bai Lu rescued him from prison. The two fled to the suburbs in a hail of bullets; Bai Lu was shot to cover Sheng Huaiyuan, and entrusted him with unfinished tasks before his death; Sheng Huaiyuan completed the explosion alone, Sato was killed, and the Nightingale organization collapsed; after the war, Sheng Huaiyuan chose to continue to lurk, waiting for the next order from the organization. Paramount reopened, and the dance music remained the same.
