Historian James Reston Jr. has written about Columbus, Richard the Lion-heart, and the year 999, but here he tackles something much closer to home — the harrowing neurological disease that began afflicting his daughter Hillary when she was 18 months old. Dozens of similar books are published each year, but Reston’s stands apart because of his skill as a writer; he intertwines medical information with a father’s heartbreak on almost every page of Fragile Innocence.