E-book extra: Jefferson's very private letter to Maria Cosway, "My Head and My Heart"Recent biographies of Thomas Jefferson have stressed the sphinxlike puzzles of his character -- famous champion of freedom yet lifelong slaveholder, foe of miscegenation yet secret lover of a beautiful slave for thirty years, aristocrat yet fervent advocate of government by the people. E.M. Halliday's absorbing and lucid portrait recognizes these and other puzzles about this great founder, but shows us how understandable they can be in light of his personal and social circumstances.