A Big Apple nightclub singer inherits a riverboat from his late grandfather and learns, via flashback, the interesting story of how his granddaddy acquired the craft. When he won a bet during a fight over possession of the boat, the crafty old gambler not only acquired the riverboat but also the rights to the loser's granddaughter. When the singer learns of this he goes to the now-old loser, and with the help of the granddaughter, who has grown into a beautiful and talented young woman, reconciles with him. Together the three decide to turn the rickety old boat into a fabulous showboat. Songs include: "Cruisin' Down the River," "There Goes That Song Again" "Pennies From Heaven" and "Father Dear." ~ Sandra Brennan, All Movie Guide