A Hong Kong mob boss is killed by a rival gang, leaving the business in the hands of his daughter, and when the gang commits more mayhem on her wedding day, she sets out for revenge.

徐钢（张丰毅 饰）是女子特警队的教官，平日里不苟言笑，表情令人生畏。在某废异工地上，他正给姑娘们布置着搜索任务：小薇和小娃，李睿玲和方婷都进入各自位置，狙击手小黄也把枪囗瞄准了歹徒，待徐钢下达命令后，看似无懈可击的演练仍让教官提出不少问题。新一轮超负荷的训练又开始了，徐钢现场督战，容不得姑娘们丝毫马虎。方婷的父亲身居要职，他不忍女儿再从事这种危险工作，通过威望向徐钢施压，却被徐断然拒绝。方婷仰慕为国捐躯的哥哥，一心想成为中国最优秀的女特警。时光荏苒，行将毕业之机，徐钢的老班长李睿玲的父亲英年早逝，徐钢一改往日的严厉，安慰着痛不欲生的李睿玲......

A young man wants to be a Hong Kong police officer but is too short to qualify. However, he doesn't let that stop him: he goes around impersonating an officer, investigating crimes and busting criminals. One day, he interrupts a bank robbery (by three men in drag), gets shot in the process and dies. When the case is assigned to a female investigator, he returns as a ghost to lend a hand at solving the robbery.

An aging crime boss discovers his rebellious daughter is dating a punk. His former gang members try to bring her back using tricks and force, only to find out the punk is tied to the drug business in America, and is not to be messed with.