'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. Lucky for him, the boy understands how it is. When he discovers Ralph in his thwarted attempt to abscond with the toy bike, Keith generously encourages the rodent to ride. He even teaches him the simple trick of starting the motorcycle: 'You have to make a noise… pb-pb-b-b-b.' The subsequent situations Ralph motors into require quick thinking and grownup-sized courage.