Precious Ramotswe, “Botswana's foremost solver of problems,” is used to handling mostly straightforward domestic cases, which makes a series of anonymous letters threatening her and her prickly assistant, Grace Makutsi, all the more disturbing in Smith's triumphant ninth No. 1 Ladies' Detective Agency novel (after The Good Husband of Zebra Drive
). The search for whoever penned the letters coincides with a new commission: Manka Sebina, whose birth parents gave her up as a child, hires the agency to track down any living relatives. Both problems afford Mma Ramotswe ample opportunity to display her winning blend of insight into others' motivations and an endearingly naïve belief in the best in human nature. Significant, if incremental, developments in the lives of the community Smith has lovingly created over the course of the series will intrigue old fans. Immediately accessible to newcomers, this entry will prompt them to seek out the earlier books. (Apr.)
