Once again, writer Irving Stone provides his readers with a "biographical novel", like his masterpiece, "The agony and the ecstasy" (about Michelangelo). Stone is a very competent author, and takes time to do his researches, so the information you'll find in his books can be trusted to be true - he also provides a bibliography about his "subject" at the end of the story.
"The origin" is about Charles Darwin, the man who came up with the theory of the evolution of the species by natural selection. In fact, Darwin, living in a static, very religious society, was one of the first scientists to dissociate science from religion, even if at the time it was not his intention, and had many problems because of his theories. Darwin's life was very interesting, from his humble beginning as an observer aboard HMS Beagle to his late and prolific years, when he wrote about varied subjects, becoming one of the first "scientific bestsellers" in the world.
Darwin's life is very well depicted in "The origin", and the reading is not a hard one, even if it's kind of slow. But Stone only presents facts, and makes little effort to present his thoughts about the subject. This is not an insightful kind of biography, more like Darwin's diary written in a more pleasant way. Nevertheless, an excellent book, that provides very useful information about one of the greatest men of all times.