Precious Ramotswe, traditionally built owner of the No.1 Ladies' Detective Agency, feels that her tiny white van, which has carried her about her business with such steadfastness and reliability, should be replaced by a more modern vehicle. Precious's usually loyal husband, the wonderful Mr J. L. B. Matekoni, takes a different view. Alongside day-to-day matters - such as Mma Makutsi's dowry negotiations - there are more difficult problems for Mma Ramotswe to solve. A client, who was adopted, asks her to trace her biological family. But will Mma Ramotswe's searches bring happiness or something rather different, something rather frightening?