It is wartime. As the bombs are falling, Carrie and her little brother Nick are evacuated to Wales where they are billeted to the home of the bullying Mr Evans and his timid sister Lou.

At first they are terribly unhappy. But when they go to visit their friend Albert at Druid's Bottom, they discover great warmth and happiness. For in that wonderful house lives Hepzibah Green, who knows magical stories, and the strange Mister Johnny who speaks a language all his own. Then things go wrong and Carrie takes matters into her own hands - without guessing the awful consequences ...