In 1964, Mary Pinchot Meyer, the beautiful, rebellious, and intelligent ex-wife of a top CIA official, was killed on a quiet Georgetown towpath near her home. Mary Meyer was a secret mistress of President John F. Kennedy, whom she had known since private school days, and after her death, reports that she had kept a diary set off a tense search by her brother-in-law, newsman Ben Bradlee, and CIA spymaster James Jesus Angleton. But the only suspect in her murder was acquitted, and today her life and death are still a source of intense speculation, as Nina Burleigh reveals in her widely praised book, the first to examine this haunting story.