Ernie Reardon, the superintendent, and Bill O'Hara, the foreman, of a construction company crew working on a bridge to a remote valley, are constantly quarreling over small and minor matter, especially when it comes to Peg Mallory, whom both men are romancing and Peg enjoys the attention. Thed work is suspended when a worker is killed, but a flood is approaching and the valley citizens are in dire straits unless the bridge is completed - in a hurry.

Yu Ping comes to Hong Kong in search of the murder who killed her father. She sings in a nightclub and meanwhile hires detective to track down the killer. On the stage, Yu Ping deeply fascinates Black Dragon, but she has a liking for the man next to him, with the name of Ox. They start to fall in love with each other. In an incident, Black Dragon is killed. Black Dragon’s sister and Ox denounce to avenge him.

A young woman named Katherine Alden becomes the unwanted victim of her new handsome next door neighbor Caleb, after her and her husband and son moves to a new town for a fresh start from a robbery.

Three lazybones friends manufacture a firebomb and place it in a cinema. Pearl, a sadistic young girl, has observed the scene, follows the bombers and starts to manipulate them. The four criminals plan more and more daring acts.

This early leftist social drama from Hong Kong offers a panoramic portrait of a crumbling apartment complex and its down-and-out denizens, including a taxi driver, an unemployed teacher, a professional reduced to selling his blood and, of course, a venal landlord. In addition to establishing an omnipresent theme in Hong Kong cinema – the plight of the urban poor – the film is also a prime example of the popular melodramas of the time, which featured displaced Mainland film stars.