Sandra Croft gets drunk because her boyfriend has left her and accidentally sets fire to her apartment. Luckily she is saved without any injuries by PC Rowan. The incident makes Sandra fall in love with Nick, but she turns resentful and revengeful when he does not return her affection. Greengrass has a new scheme: guided tours and bird watching! But he soon finds out that there is more to it than just setting up a shelter as a hide, handing out copied old maps and then collect the money.

PC Bellamy takes over one of Alf Ventress' old contacts, Vic Smalley. From him he learns about Ray Craven, who is flush with money and it is not through taking sheep to market, which is his official business. But Bellamy does not exactly make the top of Sergeant Miller's charts when the police make a raid on one of Craven's lorries and find only sheep. When Gina tidies up in her guest Derek Ford's room she discovers that he works for the Inland Revenue. He is "on tour" in the area and Vernon Scripps is next on his list. In fact Scripps owes so much in back tax that he will never be able to pay it and he decides to do something drastic. Too late for him Oscar Blaketon discovers that Ford is a fraud with no connection at all to the Inland Revenue.

Three children are exploring the garden of a sinister, old house near Aidensfield when the youngest of them, Peter, suddenly disappears. The whole village takes part in the search. The police concentrate their efforts around a mysterious van that Gina saw racing by just as the two elder kids pass her and PC Wetherby in the street; the police fear the boy has been kidnapped. Luckily he is soon found in a well near the old house, and a major rescue operation is launched. The rescue draws nationwide attention and soon Aidensfield is invaded by journalists from all over the country- including the prominent Sheridan Ralph who is very upset when he can't get a room at the Aidensfield Arms. Aunt Peggy does not hesitate to take advantage of the situation and offers him a room at her place - for at small fee of course. This decision is one she soon finds reason to regret since he is a very bothersome customer. Oscar Blaketon has other concerns than the rescue. He has noticed signs of a growing attraction between Gina and the newly divorced PC Wetherby-signs that don't go unnoticed by Sheridan Ralph either. But there might be a much more interesting story to tell when suddenly gun shots are fired from inside the old house, and it is determined that the house is inhabited by an aged and mysterious man.