Dan and the Village Fête, by Richard MacAndrew
Recording in British English

It’s the day of the Steeple Compton village fête and everyone is happy. Everyone except Sue Barrington, the new girl in town. Sue’s friend Dan is worried. Dan finds out that someone called Nemesis is bullying Sue and he decides to help. 
Who can Nemesis be? And why does he or she want to hurt Sue? Only Dan the detective and his dog Dylan can find out.