Ralph is a curious little mouse who lives a quiet life behind a knothole in a room at the Mountain View Inn. His world changes completely when a young boy named Keith checks into the hotel, bringing along a shiny red toy motorcycle that is exactly the right size for a mouse. Unable to resist, Ralph sneaks out while Keith is asleep to examine the incredible machine. After a terrifying accident lands him at the bottom of a metal wastebasket, Keith discovers Ralph. Instead of being scared, Keith teaches the little mouse how to ride the motorcycle by simply making a motor noise with his mouth. Suddenly, the hotel hallways become a massive racetrack for Ralph. But with great speed comes great danger. Ralph must dodge a vacuum cleaner, escape a rowdy terrier, and find a way to help his new friend when Keith gets sick. This fast-paced, imaginative adventure is a thrilling ride that proves heroes come in all sizes.