Meryl Johnson is the manager of the Ellerby Building Society. One day she gets two uninvited guests. They want to keep her and her son Toby as hostages for a couple of days and then make her pick up all the money of the society for them. Luckily she manages to get a warning off to PC Ventress without the villains noticing it, and the police put her cottage under surveillance. There have been a number of salmonella related deaths in Aidensfield. The only common denominator seems to be the homemade chicken pie of the Aidensfield Arms. When Toby Johnson gets ill PPC Nicholson, who is on surveillance duty, reports the good Dr. Summerbee leaving, but not arriving (because he was taking a nap). Speaking of Dr. Summerbee, she gets a secretary to help her at the surgery, Jenny Latimer.

The future has arrived at the Ashfordly police station in the form of the new sergeant George Miller and a state-of-the-art Ford Zephyr police car. He also has plans to close down the police house in Aidensfield and move PC Walker to Ashfordly permanently. Apart from that Sergeant Miller is very old-fashioned and extremely narrow-minded. His first case in charge of the Ashfordly police is a series of wage snatches. After yet another snatch PC Bellamy and the Zephyr's regular driver PC Yates give chase to two suspects in a Mini Cooper, but they are shaken off when the robbers go where the big police car cannot follow them, and only PC Walker on his motorcycle is able to keep up the pursuit, but crashes when the robbers block the road. The villagers of Aidensfield are not taking the possible loss of their police house lightly of course and organize a protest.