L. Patrick Gray III was the man caught in the middle of the Watergate scandal. He was a lifelong Republican, but Richard Nixon considered him a threat. Closing in on the conspiracy, Gray became the target of one of Watergate's most shocking acts—Nixon's "smoking gun" attempt to have the CIA stop the FBI investigation. And when the U.S. Senate focused its attention on Gray in April 1973, the White House threw him to the wolves; John Ehrlichman famously advised that he be left to "twist slow...