"Like the Rockefellers and the Kennedys, the Kochs are one of the most influential dynasties of the modern age, but they have never been the subject of a major biography... until now. Not long after the death of his father, Charles Koch, then in his early 30s, discovered a letter the family patriarch had written to his sons. 'You will receive what now seems to be a large sum of money,' Fred Koch cautioned. 'It may either be a blessing or a curse.'...