Ferrocarrilla del Norte - Poisons: Agatha Christie and ricin

Agatha Christie's last poison is ricin. Instead of using it in a novel, he used it in a short story, The House of the Lurking Death, in the story collection Partners in Crime, Matrimony de Sabuesos. The most striking feature of the use of this poison is that it was anticipated in time by Christie, because at the time of writing the story it was not known what kind of poison rhizin was. Mentxu Aiertz told us the story.