What would you give up to achieve your dream? When J. P. Morgan hired Belle da Costa Greene in 1905 to organize his rare book and manuscript collection, she had only her personality and a few years of experience to recommend her. Ten years later, she had shaped the famous Pierpont Morgan Library collection and was a proto-celebrity in New York and the art world, renowned for her self-made expertise, her acerbic wit, and her flirtatious relationships...