麦琳（麦家琪饰）为替几年前“屯门色魔”案中惨死的姐姐报仇、任盈盈（吴文忻饰）为了追求的警察师兄（吕颂贤饰）、狗仔队记者程嘉美（张文慈饰）为了到警校获取暴料新闻，三个女孩子带着不同的目的报考了警校。
沈教官（梁铮饰）极其严格，并在数月前曾经累死一名学员。文琳性格倔强冲动，和爱美活泼的任盈盈矛盾冲突不断，而同时程嘉美正在到处搜集资料拍照，到底三个人能不能经受住警校的考验呢？

When the Ronin Gang robs an armored car, three cops — Chan, Fong and Wai — go on the warpath. Each has a personal interest in bringing down Ronin leader Tien: he killed Chan's fiancée, humiliated Fong and kidnapped Wai's brother.