Ralph is a mouse who lives in the run-down Mountain View Inn, a battered resort hotel in the Sierra Nevada of California. Ralph longs for a life of danger and speed, wishing to get away from his relatives, who worry about the mice colony being discovered. One day a boy named Keith Gridley and his family visit the hotel on their way through California. Keith leaves a toy motorcycle on his bedside table, which interests Ralph. While Keith is away, Ralph attempts to ride it, but cannot figure out how to start it. Startled by a telephone ring, he and the motorcycle fall into a metal wastebasket.