The Lowcountry of South Carolina is where BY INVITATION ONLY begins at a barbecue engagement party thrown by Diane English Stiftel to celebrate her son’s engagement. The bride’s father, Alejandro Cambria, discovers the limits and possibilities of cell phone range, while the mother of the bride, Susan Kennedy Cambria, learns about moonshine and dangerous liaisons. Soon the novel zooms to Chicago, where the unraveling accelerates. Nearly a thousand miles away from her comfortable, familiar world, Diane is the antithesis of the bright lights and super-sophisticated guests attending her son Fred’s second engagement party.