Ever exuberant, extraordinarily productive Alexander McCall Smith once again channels the life and world view of a certain Precious Ramotswe in this latest installment in his endlessly pleasurable No. 1 Ladies' Detective Agency. Our sensible, redbush tea-drinking heroine helps a woman find her relatives, enjoys the company of her sweet-hearted husband (proprietor of Tlokweng Road Speedy Motors) and gets mixed up in the lives of her neighbors. Not much action for a murder mystery but McCall Smith wittily conjures the society, folklore and daily life of bygone Gaberone.  (BOT31, $14.95)