Sons of Wichita: How the Koch Brothers Became America's Most Powerful and Private Dynasty

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."

Fred's legacy would become a blessing and ...