In the seedy underworld of Manhattan, a woman dares to stand up against one of the city's most powerful gangsters, Johnny Vanning, who owns a gaudy nightclub and exploits its bar girls to ensure their loyalty and obedience. As Mary, one of the hostesses, becomes embroiled in Vanning's world, she witnesses a tragic accident that sets her on a path of revenge against the powerful gangster, with the help of District Attorney David Graham.