Kathryn Harkup is a trained chemist, a freelance science communicator delivering talks and workshops on the quirky side of science, as well as a huge Agatha Christie fan, and author of A is for Arsenic, a new novel where each chapter takes a different Christie case and investigates the poison (or poisons) the murderer used.A is for Arsenic looks at why certain chemicals kill, how they interact with the body, and the feasibility of obtaining, administering and detecting these poisons, both at the time the novel was written and today. Fourteen novels. Fourteen poisons. Just because its fiction doesn't mean its all made-up ...