Charles Darwin's theory of evolution - found in his 1859 work The Origin of Species - shocked Victorian scientists, who equated Darwinism with blasphemy and atheism. But the religious issue never troubled Darwin, a deeply moral man if not a profoundly religious one. He believed that evolution by natural selection was not incompatible with belief in God, and the furor over his work shocked Darwin. Here, from the acclaimed historian Walter Karp, is the little-told story of the complex genius who decoded one of the world's greatest mysteries.