Tammy begins working as a secretary for wealthy industrialist Mr. Brent, and gets tricked into inviting her river folk relatives to a white-tie affair.

Tammy is scorned by Lavinia Tate as not well born for her son until a gruff man and his sister arrive claiming to be kin of the Tate family.

Determined to pep up her Grandpa, Tammy arranges fake love letters that he mistakes as a burning passion from Lavinia.