In 1921, Franklin Delano Roosevelt--the 1920 vice presidential candidate on the losing Democratic ticket--was overcome by an illness that left him unable to walk. He retired to his family estate in Hyde Park with his wife, Eleanor, who was suffering emotional problems of her own. For the Roosevelts, it was the low point of their lives. At that juncture, Roosevelt's advisor, Louis Howe, moved in with them, leaving his own family behind. Howe set to...