Mulan's friend Du Gui Lian visits the orchid but is mysteriously killed in the mortuary after not finding Lan Hua. Meanwhile, a corpse's teeth are stolen in the mortuary. Lan Hua's sister, Mu Xiu Zhen, discovers a dentist's business card left by Du Gui Lian and investigates alone. Unexpectedly, the dentist's clinic explodes, and Xiu Zhen is abducted by the Japanese criminal genius Sheng San Lang. Lan Hua goes to the police station to discuss with her friend Gao Xiang and finds a complete weighing scale in the explosion scene photo. Gao Xiang orders the scale to be brought back to the police station and waits with Lan Hua at the scene for the criminals to appear. However, they are trapped in a snow room and are fortunate to be rescued by the clever escaping Xiu Zhen. Inside the police force, Officer Yang steals the plan and the password hidden in the scale and the teeth, assisting San Lang to seek treasure at 'Hell's Gate' as instructed. However, after San Lang finds the treasure, he shoots Yang. Officer Guan pretends to assist San Lang but is actually an inside informant. In the end, together with Lan Hua, Xiu Zhen, and Gao Xiang, they eliminate the gang at the treasure location. Chinese Name: 女黑侠威震地狱门 Foreign Name: Lady in Black Cracks the Gate of Hell Other Translations: The Hell's Gate Production Time: 1967 Produced by: Xianhe Port United Image Company Production Region: Hong Kong, China Director: Luo Chi