Barnaby investigates a death which looks very much like suicide. The dead man was a troubed and depressed gambler on a losing streak, but Barnaby's nose tells him to look for a murderer. During the investigation he recognizes someone from his past, in the shape of Dr Jane Moore.

Barnaby's wife, Joyce, finds a dead body on the Midsomer Florey village green while taking part in a watercolour painting class, and she recognizes it as the elderly Miss Fairfax.Barnaby is given the case, then finds himself taken off it and replaced by a team from the National Intelligence Squad, while he is assigned to deal with a missing handbag. However, he continues his investigation into the murder, finding deceit and double-dealing. It appears that 'Miss Fairfax' was not an elderly spinster at all, but a young detective sergeant from the National Intelligence Squad working under cover, and that her colleagues are busy fitting up the village handyman for the murder of an old lady who never was. He discovers that someone is busy hunting for some five million pounds still missing from an old robbery. In the closing moments, Barnaby has to lock two of the National Intelligence Squad's officers in a bank strong-room, where they are trying to snatch the missing cash, and to arrest the

Someone is decimating the ancient Smythe-Webster family of Upper Walden, and the bad blood between the villages of Upper and Lower Walden is renewed with a vengeance. First, young heart-throb actor Larry Smith (alias Laurence Smythe-Webster) dies in an explosion at a publicity event for a new film. House of Satan is based on a book by a local writer, the late Ellis Bell of Lower Walden - a village whose inhabitants are referred to by its Vicar, the Reverend Simon Smythe-Webster, as ""the weasels of the wild wood"".The next to die is Larry's uncle, House of Satan producer Frank Webster (Francis Smythe-Webster), electrocuted to death on his exercise bike. Finally, Barnaby's principal suspect, Danny Pinchel, the family's cook, is drowned in a large bowl of tomato soup...Barnaby realizes he is dealing with an historic grudge, and he enquires into the family's antecedents.

Julian Shepherd, who has most of his money invested in Charles Edmonton's new invention, is found drowned, and there is every appearance that he killed himself due to money problems. Then a villager who has been stealing peregrine falcon eggs from Charles's widow is also found dead, and Barnaby and Troy investigate.