Presents the further adventures of a motorcycle-riding mouse who goes to school and becomes the instigator of an investigation of rodents and the peacemaker for two lonely boys.

A reckless young mouse named Ralph makes friends with a boy in room 215 of the Mountain View Inn and discovers the joys of motorcycling .

Ralph, a victim of the generation gap, rides his cycle away from his unsympathetic family only to be imprisoned in a summer camp.