The Silent and the Dead — Stephen Wheeler

Winifred Jonah seemed like an ordinary Norfolk housewife, jolly, plump and harmless. Yet her bland exterior concealed a sinister secret. At fourteen she had already murdered her aunt and uncle and forty years later it was her husband's turn to die. Even so she might have made it to her own grave without further incident if she hadn't met Colin Brearney. He thought she was going to be a pushover, but he had no idea who he was taking on. The day Colin knocked at her door was the beginning of a nightmare that could only end in blood, silence and death...