"Pb-pb-b-b-b. Pb-pb-b-b-b." With these magic vocables, Ralph the mouse revs up a dream come true--his very own motorcycle. Living in a knothole in a hotel room, young Ralph has seen plenty of families come and go, some more generous with their crumbs than others. But when young Keith and his parents check in to the hotel, Ralph gets his first chance to check out. He has always fantasized about venturing beyond the second floor, maybe even outside. Curiosity overcomes caution, and Ralph must have a go at Keith's toy motorcycle. Soon, the headstrong mouse finds himself in a pickle, when all he wanted was to ride a motorcycle.