Three mice run, cavort, sing and dance around in the stores and restaurants a big city at night. They wind up in a café for an early-morning snack and stocking up on food provisions before they return to the safety of their den beneath a man-hole cover in the street.
The mangiest pup at Pete's Pooch Palace catches the Captain's eye. He takes it home, but Mama is less than thrilled; she forbids it to stay in the house.
A woman and a man vying for a woman's affection: the usual love trio? Not quite so since the belle in question is Lorraine de Grissac, a very wealthy and alluring society woman, while one of the two rivals is none other than Arsène Lupin, the notorious jewel thief everybody thought dead, now living under the assumed name of René Farrand.
The Cabin Kids, in between song and dance numbers, are at the county fair with intentions, fair or foul, of helping Mammy win the Pancakes cooking contest.
Reflecting the filmmaker's passion for automobiles, who in his youth participated in car races, the film portrays the attempt to manufacture a new model in the Ford factory in the city of Porto.