In the Line of Duty 4: Witness (皇家師姐IV:直擊證人). 1989. Hong Kong. Directed by Yuen Woo-ping. Martial arts direction by Yuen Shun-yi, Wong Kwan, Cho Wing. With Cynthia Khan, Donnie Yen, Michael Wong. DCP courtesy Fortune Star Media. In Cantonese, English, Mandarin; English subtitles. 94 min.
Yuen Woo-ping’s *In the Line of Duty 4*—the fourth entry in a series of standalone police thrillers featuring formidable female action stars—follows a Hong Kong police officer (Cynthia Khan) and an American detective (Donnie Yen) as they uncover a drug-trafficking conspiracy stretching from Seattle to Hong Kong. Groomed as the next Michelle Yeoh, Khan, also trained as a dancer, displays dazzling speed, precision, and fearlessnesses in hand-to-hand combat and death-defying stunts atop moving vehicles. Yen, in a breakout performance, announces himself as a major new action star, combining explosive athleticism with magnetic screen presence.