Mandy Jenkins (Cora Green), an African American cook for a wealthy white family in Birmingham, Alabama, discovers her husband Cornell is having an affair with Eloise Jackson (Hazel Diaz).

Eloise leaves Birmingham and relocates to the Harlem section of New York City, where she gets a job as a cabaret vocalist under the false name of Cora Smith.

When Eloise breaks her leg during a drunken fall, Mandy is recruited as the last-minute substitute and becomes a musical star as the revue is transferred to Broadway.

[1] Green performs the Yiddish tune Bei Mir Bistu Shein for her star-making musical sequence.

[2] Actress Dorothy Van Engle, who had a supporting role as an assistant producer, is credited for inventing a key scene in Swing!, where her character and Mandy are sewing together.