Tom Perkins had a dream. It wasn't to get rich, acquire power, or marry into fame. As the man most responsible for creating Silicon Valley, he had done all that. His venture-capital firm, Kleiner Perkins Caufield & Byers, remains the most celebrated money machine since the Medicis. He'd helped found Genentech and fund Google. And in 2006 his resignation from the Hewlett-Packard board triggered the revelation of a spying scandal that dominated the...