Nick and Jo Rowan return from their honeymoon in Spain. They find out that he has been made acting sergeant at the Ashfordly police station, while Blaketon has taken over the post office. A fair is visiting Aidensfield and one of its main attractions is the wall of death and its riders Dirk and Liam. Especially 15-year old Tracey Knight is fascinated by Dirk who has promised her a spot on the show. Dirk is seriously injured when he crashes off the wall during practice. The police soon find out it was not an accident. Another attraction is the mouse show, which Greengrass' lurcher Alfred decides by eating the favourite owned by the very unpopular Trevor Lammas. The next day Greengrass finds his dog lying on the floor with all signs of poisoning and accuses Lammas, who starts to have a series of small mishaps.

A fire breaks out at the warehouse of Pyke Textiles. It is arson and the owner Peter Pyke is not able to throw any light on the matter, but his ex-wife Beryl holds a grudge against him for giving evidence, when she was convicted of fraud against the company and she has recently been released from prison. On the other hand a witness, Rosie Compton, saw Pyke's car near the warehouse at the time of the fire Vernon Scripps has finally settled on a mansion for his future home and wants David as his butler and chauffeur, but David will much rather stay at the cottage. When he goes to tell Bernie he discovers that his brother has restored an old horse-drawn hearse and immediately sees a business opportunity and goes into business with his new neighbour Amanda Buxton.