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Guerrilla member Ting Siu-yuen works as a playwright and Lee, the leader of an opera troupe. They conceal their identities in the troupe in order to gather military intelligence. Yuen gradually falls in love with the lead actress Mui Law-heung. Ting is unsettled to learn that County Chief Fong covets Mui. He sneaks into Fong's residence and is astounded by the sight of his old lover Pak Kuen, now Fong's wife. Fong colludes with the military chief in conducting vicious schemes. With Kuen's help, Yuen is able to get the intelligence. But as Heung is not an insider, she reports to the Governor about the illicit relationship between Yuen and Kuen. Kuen backs Yuen to eliminate the conspirators and bring about the union of Yuen and Heung.
During the anti-Japanese war, truck driver Lee Sing's secret mission is to transport weapons and supplies for the resistance fighters. Sing has to deliver a signal gun to guerrillas at ten on that night for launching an attack against the Japanese soldiers. He works for the Ko's family and he has to send the gun to the provincial city to prevent it from being bombed. Sing carries on his vehicle a group of passengers including a Chinese traitor, a guerilla, a compassionate nurse, a comfort woman on the run, a teacher and his pregnant wife. Sing is given a hard time by the Japanese troops on the road. The Japanese ransack the vehicle and they find the signal gun. All the males on board are being interrogated with torture, but the passengers pool their efforts to subdue the traitor and accomplish their mission.
The fourth film of the 5-film series The Best Secret Agent series of taiyupian (Taiwanese-language cinema), which was also dubbed into a Mandarin version.
Li Tsui-Ying (Pai Hung), the Best Secret Agent, disguises herself as a train conductor to assist Changjiang guerrilla leader Chiang Hsiao-Tien (Wu Chia-Chi) to evade the patrol of Japanese troops. Li adopts the pseudonym of White Peony in her Peking opera performance for the puppet government president, Han Zhaogui. Chiang discovers that his former lover Liu Feng has become Han's wife, but he finds that Liu still loves him and keeps their love token golden pheasant heart. White Peony would like to destroy the Japanese army’s project of building a secret airport. However, when she rescues Chiang from Han’s secretary, Ma Zuo-wen during an attack of Han in the cinema, White Peony falls in love with Chiang, without knowing that Chiang’s lover is Liu. In a final duel between White Peony vs Ma and Han, she realises how much Chiang loves Liu. She returns the golden pheasant heart that Ma took away from Liu to the lovers. The next day when Liu wakes up, White Peony has gone.
