Meet Ralph, the perky and reckless mouse that lives at Mountain View Inn. Vacationing boy Keith Gridley brings out his motorcycle and through the mouse hole, Ralph falls in love with it. They become friends and share the motorcycle. Ralph gets into many entertaining situations including while on an errand to find an aspirin for his sick friend, he gets caught by two teachers but eventually escapes and he finds an aspirin. He brings it to Keith who gets better, and now that his familys vacation is coming to an end, he wants to bring Ralph home with him. Ralph, however, wants to stay at the Inn, since this is his home. Keith gives his motorcycle to Ralph to enjoy as the two part ways.