In the Line of Duty, sometimes referred to as the Yes Madam series, is a series of girls with guns feature films produced by Hong Kong movie studio D & B Films which star, in the first two, Michelle Yeoh, and, in subsequent installments, Cynthia Khan as a Royal Hong Kong Police Force officer who combines the use of firearms with kickboxing.
This would continue with the fourth entry before the series would revert to using individual unique titles (though the later sequels would still be exported with the In the Line of Duty naming scheme).
A 1990 film titled The Queen's High starring Cynthia Khan was marketed in some territories as In the Line of Duty: The Beginning but it is unrelated to the franchise.
[2] Royal Warriors and In the Line of Duty 4 would be the only two entries in the series to receive official DVD releases in the United States by 20th Century Fox in 2004.
Joy Sales would also release parts 3-7 with new widescreen enhanced transfers (but not remastered) on DVD and VCD under their "Legendary Collection" banner.