In this uneven musical comedy, Philadelphia Yankee Tom Grayson (Crosby) is engaged to southern belle Elvira Rumford (Patrick). But when he refuses to duel one of her other suitors, the engagement is off and he's branded a coward. Tom gets a job singing aboard a riverboat piloted by Commodore Orlando Jackson (Fields) and eventually realizes that his true love is actually Elvira's younger and more sympathetic sister Lucy (Bennett). Fields steals everything that's not nailed down, leaving ostensible star Bing in the dust. Based on the play "Magnolia" by Booth Tarkington.