Homicide in Hampshire

One evening when Cleo Marjoribanks returned home she discovers the body of her housekeeper (Janet) - in the swimming pool. It appears that the housekeeper's husband (Dan) and Cleo's Volvo are missing. His body is discovered on a beach. He had been shot and the car is found hidden deep in the forest. Paula Linley, Cleo's friend has a teenage daughter, Margaret, whom it is discovered had known Dan. Paula found Margaret's diary and learned that Dan had had the teenager look after a sealed envelope with a small book inside. Both Dan's brother and and Janet's brother turn up looking for money. Then the village gossip is murdered in Cleo's garden in an attempt to frame Cleo and near the end of the book is a very strange car chase . Eventually Cleo is threatened, twice in one morning. The DCI in charge of the case is David 'Steaming' Kettle who knew Cleo when they were children. Does a romance develop?