Death of a perfect mother1981

Lill Hodsden was not loved in the village of Todmarsh. Vulgar and flashy herself, she had developed the nasty knack of zeroing in on everyone else's weaknesses and ridiculing them. She was just asking for it. And her own two sons were eager to oblige. In fact, they had it all planned for Saturday night. But by Friday, Lill was dead. Who had done her in? Who had beat them to the punch? Had someone committed the perfect crime in an angry little town where everyone had a perfect alibi—and a perfect motive for murder?