To the Land of Long Lost Friends by Alexander McCall Smith

Things are very quiet at the No. 1 Ladies Detective Agency. Mma Ramotswe, Mma Makutsi, and Charlie are wondering when work will pick up. Their only case is investigating whether the husband of their client is really taking mathematics lessons or having an affair. When Mma Ramotswe sees a childhood friend at a wedding, a friend she thought died years ago, she is stunned. After the friend, Calviniah, explains that her supposed death was an instance of mistaken identity, Mma Ramotswe agrees to look into why Calviniah's daughter, Nametso, has become distant from her. In addition, the agency decides to examine the circumstances of a woman named Poppy, who gives a new Mercedes to a local preacher named Reverend Flat Ponto. On a personal front, both Mma Ramotswe and Mma Makutsi wish Charlie the best in his goal to make Queenie-Queenie his wife. It's seems an almost insurmountable task because of Charlie's lack of income compared to Queenie-Queenie's family wealth. Will Charlie succeed or be left waiting a long time to make Queenie-Queenie his wife?