Jo Miller and her boyfriend Grag Parsons arrive in Aidensfield to organize a peace demonstration at an abandoned air base which the Americans plan to reopen. They team up with local troublemaker Pete Grimshaw. But the police has gotten wind of their plans and Division asks Sergeant Miller to keep an eye on the demonstrators. That does not go quietly. PC Walker is accused of beating up Greg Parsons and Jo is arrested to Sergeant Miller's displeasure, because she is his daughter! The new vet Fergus is on his way to the zoo with a cobra in a box. On his way he stops at Bernie's garage for some petrol and to ask Rosie out. When he returns to his Land Rover he discovers that the snake has escaped.

Nurse Cassidy's Land Rover with her medical bag gets stolen outside the Aidensfield Arms. The car is quickly recovered, but there is no trace of the bag and its contents. Some of it turns up though when Ricky Smith is hit by a car and PC Walker finds an empty pill bottle at the site. Sergeant Miller cannot wait to get young Ricky into court, because his mother who is a prominent lawyer has shielded him too many times. And she does not hesitate to make a complaint against nurse Cassidy for negligence. It does not matter to her that Cassidy was in a hurry to call an ambulance and saved somebody's life. The father of Swedish sailor Larson has died and he wanted to be buried at sea. But his ship is late and Larson gets permission to keep the body at Bernie's chapel for a couple of nights. David discovers that the coffin has breathing holes and that the corpse is very much alive. Unfortunately a little too late for him and Aunt Peggy. And PC Younger finally gets his driving licence.