To Kill a Wife — J.M. Gregson

But one man is unconvinced. Detective Inspector Peach finds it hard to believe that the mild-mannered Martin Hume is capable of killing anyone, and sets out to prove it. With the investigation reopened, it soon becomes evident that Verna Hume had a talent for making people dislike her and was universally loathed, especially by her close family and friends. Now, Peach is faced with six suspects, all with motives, all with the opportunity and all with something to hide...