Lethal Lady

Hong Kong police officer Mina Kao marries Huang Tsung-Pao, who is a member of a law enforcement dynasty. His father and his many sisters are also officers, and the eldest sister Chia-Ling is one of the highest ranking women in the police department. When a Vietnamese gang begins a rampage through the city, the women must overcome their suspicion of one another to bring the criminals to justice.

As a cop her business is the law. As a widow it's revenge!