A Is For Arsenic

Agatha Christie?s detailed plotting is what makes her books so compelling. Christie used poison to kill her characters more often than any other murder method, with the poison itself being a central part of the novel, and her choice of deadly substances was far from random; the chemical and physiological characteristics of each poison provide vital clues to discovery of the murderer. With gunshots or stabbings the cause of death is obvious, but not so with poisons. How is it that some compounds prove so deadly, and in such tiny amounts?