It's been two years since Fidge's father passed away, and in that time, Fidge has taken her role as patient big sister to four-year-old Minnie very seriously. But a moment of frustration leads to Minnie getting hit by a car, and Fidge is stuck staying with her cousin Graham while her mother stays with Minnie in the hospital. In a strange turn of events, Fidge and Graham find themselves in the land of Wimbley Woos where they must stop the evil dictator, Wed Wabbit.