Dr. Summerbee helps 16-year old Debbie White to get on the pill, because she thinks the relation with her boyfriend Carl Lomax is serious enough for that, and her friend Jenny wants some too. But their parents and the parents of their peers think the good doctor has gone too far. Somebody throws a stone through a window of the police house in Aidensfield, but sergeant Craddock thinks there are more important matters to tend to than finding the culprit. A big inspection is on in a few days and he wants the police station to be in tiptop shape. He changes his mind however when his own police car gets vandalized with paint. And the vandal is just getting started. Vernon Scripps accuses David of eating too much, but they must soon realize that they have an unwanted visitor.