Life is never quite the same after Quilla meets Biddy at a dancing display at Miss Pargeter's school, rival and close neighbour to her own beloved Thursfield. When Biddy arrives at Thursfield in the new term, disaster seems to follow-always heaped on poor Quilla's head! She loses her best friend, is accused of sending a tennis ball into Mrs Bernard Lomax's garden, and is even charged with being a 'Parge' sympathiser! As Quilla declares to her mother, 'since that Parge dancing show everything has gone wrong--everything.'
Biddy and Quilla chronicles Quilla's trials and how everything manages to come right in the end.