Synopsis: "Try not to walk like a first basemen," Mama (Rosemary DeCamp) tells tomboy Marjorie (Day) as she prepares to date college man Bill (MacRae). The advice takes. The lovebirds hear wedding bells ahead, just as soon as Bill gets his sheepskin. But World War I rages "over there." And Papa (Leon Ames) rages at home after a flap with his prospective son-in-law. Will harmony return to this Hoosier home? Surely Day and MacRae will make musical harmony. And On Moonlight Bay will have you sailing along.