Lethal Dose of Love — Cindy Davis

What does it take to make a law-abiding, outgoing, philanthropic woman murder her only son? Sean's misdeeds began with the thefts of school kids' lunches and toys, and escalated to womanizing and blackmail. The town's reputation is in jeopardy. His mother puts up with it for twenty-seven years, four months and seventeen days-then she snaps. Claire devises a plan to poison him. Trouble is, she buys the plant, from which she derives the poison, in a good friends' shop. When Payton comes under suspicion for the murder, Claire descends into deep depression. She's committed one murder to protect her town, will she commit another to protect her friend?