Vince Wain is visiting his ex-wife Brenda and their son Martin. While he is at their house he helps himself to their savings and is very surprised when Brenda goes to the police about it. During the following row Martin decides to run away and asks David to help him. They even become blood brothers and promise each other not to let each other down. Mr. Turner is cleaning windows at Ashfordly Hall when he is bitten by his lordship's dog Jack and demands that the dog is put to sleep. Lord Ashfordly even risks being charged in that he cannot prove that the dog is not a danger to the public - no easy task because Jack has quite a history in the biting department. Luckily for him help is not far away and Aunt Peggy offers to train him - the dog that is, not Lord Ashfordly.

PC Walker and PC Bellamy give Malcolm Stainsby a lift to his home because of his bad legs. Stainsby has been away since the war, but his wife - or rather ex-wife - Diane says that her husband Malcolm is dead. She even has his death certificate to prove it. Stainsby claims that he has only recently regained his memory after a cinema he was in was hit by a flying bomb. David and Aunt Peggy surprises a mushroom collector on their land and Aunt Peggy discovers that some people will pay good money for mushrooms. And while all mushrooms are eatable their effect may differ quite a bit. Sergeant Miller books PC Younger on a driving course. But Younger only has a provisional driver's license and needs a lot of driving experience. He gets Rosie to give him driving lessons and soon the whole village puts more into their relationship than there actually is.

With no village bobby in Aidensfield Tommy Unsworth and his motor biking friends seizes the opportunity to make a lot of trouble in the village. Even Aunt Peggy is upset that the bikers are trespassing on Lord Ashfordly's land upsetting the natural order of things by frightening the game away and leaving her traps empty. But when it will take a while to get at permanent replacement Miller organizes a stop gap. Thus PC Joe Mason moves to Aidensfield on a temporary basis while he awaits his transfer to the Met. Mason is very resourceful and a bit of a maverick, and his senior officers were more than happy to get rid of him. The villagers are not too crazy about him either. But Unsworth is not the only source of trouble around. A professional gang from Manchester is targeting country houses in the area stealing paintings, antiques and jewelery.

PC Mason discovers that being a village bobby does not always have something to do with police work when he gives Nurse Cassidy a ride to a farm and the farmer asks him to help getting a cow out of the mud. But he also gets some real cases when somebody nicks 12 shillings from the collection in the village church and a photograph goes missing from Ashfordly Hall. Young Charlie Prentice asks for directions to Ashfordly Estate telling Oscar Blaketon that she is looking for her father and she is convinced he is Lord Ashfordly. David Stockwell decides to make a will because he is afraid to leave a mess when he dies. Maybe that was not such a good idea after all.