Mma "Precious" Ramotswe is now engaged to Mr. J.L.B. Matekoni, the kind owner of Tlokweng Road Speedy Motors. This new development provokes a hostile reaction from his unscrupulous maid, who begins plotting the disintegration of the engagement. Despite all this, duty calls, and Mma Ramotswe is asked to help find an American woman's son, who has been missing in Africa for 10 years.

Worrying about her upcoming marriage to J.L.B. Matekoni, Precious Ramotswe is confronted by the challenges of running her No. 1 Ladies' Detective Agency, a terrifying request from the matron of the Orphan Farm, and a case involving an investigation into the would-be suitors of a wealthy woman to determine if any are fortune hunters.

There is considerable excitement at The No. 1 Ladies' Detective Agency. A cobra has been found in Precious Ramotswe's office. Then a nurse from a local clinic reveals that faulty blood-pressure readings are being recorded. And Botswana has a new advice columnist, Aunty Emang, whose advice is rather curt for Mma Ramotswe's taste. All this means a lot of work for our heroine and her assistant, Grace Makutsi. But there's trouble brewing in Mma Makutsi's...

In the ninth mystery of the No. 1 Ladies' Detective Agency series, Precious Ramotswe visits a game preserve to uncover the truth about an elderly American traveler whose safari proves to be his last journey.