It is Katie's christening, and everyone is celebrating at Nicks house afterwards, when an old girlfriend of his, Gill, from the Met turns up for a visit. Nick and Gill are asked to go undercover to investigate the criminal activities of the owner of a well known gambling club. Blaketon thinks that Mr Armstrong is going to cheat in an up coming racing event by tampering with the favourite horse, ‘Fab Four'. The police are on to him, and he soon notices he's being watched so he kidnaps Gill and hides her in a horse box. Nick and Phil come to the rescue.

Arthur Wakefield suffers a heart attack after tackling Terry Tinniswood when he tried to burgle his home. Arthur dies, but Mrs Wakefield manages to identify Terry from photos and then from a line up. The Tinniswood family however claim that Terry was at home all night. Mrs Wakefield then sets out to make Terry feel guilty and insecure. Special Constable Cowley who thinks he knows everything is assigned to help Nick on his patch, but Nick isn't pleased with the idea. Cowley is determined to win the prize for the best gooseberries in the up coming flower show. - But his wife makes sure that doesn't happen. Greengrass' plan to cheat in the show goes horribly wrong!