One of Dame Agatha Christie's earliest detective novels and one of her very best.  There is a new twist or turn on almost every one of its two hundred plus pages.  When the heiress of Styles is poisoned there are suspects a plenty, from her avaricious new young husband to her pauper son-in-law to her vengeful daughter-in-law.  Enter the man whose head is full of very active "little grey cells" and not a few eccentricities.  Here's mystery writing at its best, in a book full of Christie's patented warm, insightful characterizations.