The film revolves around a crack squad of female police officers who have to deal with harassment and a lack of respect from their male colleagues, personal issues as well as some serious criminals.

Four new Banshee Squad Members join the Hong Kong Police Academy to undergo training supervised by Madam Wu. Their personalities don't click with the current Squad Members, resulting in petty arguments and duels. However, they later make peace with one another as they join the Tiger Squad Members, supervised by Inspector Kan, to undergo new training courses together and combine forces to take down a band of terrorists.

Inspector Kan (Stanley Fung), now married to Madame Wu (Sibelle Hu), has been instructed to train the Banshee Squad Members after Madame Wu goes into semi-retirement. For their next mission, the Squad is assigned to go undercover into a Casino Ship to nab a group of thieves responsible for stolen law enforcement and military weapons.

To save the Hong Kong Police Force's Banshee Squad from becoming defunct, the struggling new squad members seek the help of former officers Amy (Sandra Ng), now a divorced mom with a young kid, and May (Kara Hui), now partially mentally-unstable, to help them with their training regiment, lead by Madame Yang (Cynthia Khan). Their police skills are put to the test when they are ordered to nab a band of brutal thugs in the city.