There is to be a big CND demonstration outside the Fylingdales early warning defence base near Aidensfield, and prospective MP - Paul Melthorn is to make a speech there. Workers take offence when demonstrators are putting up posters everywhere advertising the demo and Nick has to break up a row in the pub between them. In doing so one of the demonstrators gets injured and Nick gets accused of assaulting him. Ashfordly police in the meantime are informed to police the demo and Blaketon finds out that the American Ambassador is visiting Fylingdales at the time of the demo. The demonstrators campsite is then burgled and Melthorn's wallet, which contains incriminating pictures of him having an affair with a young woman are stolen. The demo takes place and the road is blocked with demonstrators. Melthorn makes his speech but becomes ill and Kate arrives to treat him and discovers he has a weak heart. It turns out that the demonstrator who accused Nick of assault is in fact a Special Branch

Nick interrupts an armed robbery which is taking place at the Aidensfield's Arms and his hit over the head and ends up locked in the cellar with George and Claude. During the night Greengrass starts to drink himself silly and ends up giving Nick tip offs about offences that have been committed in the area recently. In the morning they are all found and rescued With a little help from Claude Nick suspects a known villain called Robinson who has a record for armed robberies and goes to visit his home, where is wife - Nell and her two daughters insist he has run of with another woman. But it emerges he in fact died from a heart attack during another recent robbery and was left on Nells doorstep and she and her daughter buried him on the moors some they could still came his National Assistance. As Nell is being questioned another robbery happens and it turns out Nell and her daughters carried on with the robberies. Meanwhile Nick shows up Claude by giving him recognition for all the crimes

The father of a young boy had dreams of his son playing cricket professionally, but unfortunately he doesn't make the local team, Maggie realises it is because he can't see the ball so he needs glasses. The same boy is caught stealing and the next day he arrives at school with bruises. Jo suspects the worse but it turns out he got the bruises playing cricket. The boy feels he's let his dad down and runs away but ends up having an accident. Claude has ""borrowed"" one of Lord Ashfordly's prize horses to breed from, but as they're taking it back Claude spots the little boy lying on the road and takes him to hospital. Nick who has been looking for the missing horse suddenly twigs what's happened when he sees Claude in a horse box. - He says he'll forget it ever went missing if the horse is returned within two hours!

Claude is in trouble when two dangerous villains dump a batch of stolen cigarettes on him. Luckily he helps the police and sets the thieves up to be caught. Jo's mother's illness isn't improving and she goes into hospital for tests but later Jo receives the tragic news that her mother has died. A girl and her dad are staying in Aidensfield. She befriends a local boy who turns out to be her brother.