Much has been written about Thomas Jefferson, and with good reason: He was the architect of our democracy, a visionary chief executive who expanded this nation's physical boundaries to unimagined lengths. But Twilight at Monticello is entirely new: an unprecedented look at the intimate Jefferson in his final years-from his return to Monticello in 1809 after two terms as president until his death in 1826-that will change the way readers think about this American icon. Basing his narrative on new research and documents culled from the Library of Congress, the Virginia Historical Society, and...