Love Is Eternal, by Irving Stone (Doubleday; $3.95), poses a problem: Can a bluegrass belle from Kentucky marry a rude rail splitter from Illinois and find enduring love and happiness in the White House? Author Stone supplies the answers in a 468-page Edgar Guestimate about the love and home life of Abe and Mary
Todd Lincoln. Following six previous biographical novels, e.g., Lust for Life (Painter Van Gogh). The President's Lady (Andrew Jackson's wife, Rachel), his latest has the birthmarks of another big bestseller. As Stone's Lincoln steps onstage, he is a feckless, unkempt...