Four war-time performers known for their concert parties, have a reunion. They decide they are still good together and form a successful nightclub act.

A scientist invents a pill to cure smokers of their nicotine addiction. However, when he makes his discovery public, he encounters strong resistance from the tobacco industry.

A jeweller is killed in a gang robbery leaving the daughter as the only witness. When the police can't build a case against him she decides to go undercover to infiltrate the home of the killer's brother. Slowly she is drawn into the world of the rival gangs.