Ah Ying (Chen Ping) is a former gangster trying to lead an honest life, and occasionally using her fighting skills to help out the girls in the factory where she now works. She befriends young colleagues Chong Lee and Shao Yin-Yin, teaching them self defence because "girls can't be weak anymore". Trouble starts when her old gang finds out where she now works.

Shaw Brothers' number one action hit of 1975, and deservedly so. The character of one-man kung-fu dynamo Big Brother Cheng and kung-fu superstar Chen Kuan-tai were made for each other. A Robin Hood-like restaurant manager who socks it to the thugs in order to make the mean streets of Hong Kong a little less mean, Big Brother Cheng made his first appearance in the extremely popular The Tea House, the success of which spawned this even more successful sequel.