The house of unexpected sisters

Mma Ramotswe and Mma Makutsi are approached by their part-time colleague, Mr. Polopetsi, with a troubling story: a woman, accused of being rude to a valued customer, has been wrongly dismissed from her job at an office furniture store. Never one to let an act of injustice go unanswered, Mma Ramotswe begins to investigate, but soon discovers unexpected information that causes her to reluctantly change her views about the case. Other surprises await our intrepid proprietress in the course of her inquiries. Mma Ramotswe is puzzled when she happens to hear of a local nurse named Mingie Ramotswe. She thought she knew everybody by the name of Ramotswe, and that they were all related. Who is this mystery lady? Then she is alerted by Mma Potokwani that an unpleasant figure from her past has recently been spotted in town. Mma Ramotswe does her best to avoid the man, but it seems that he may have returned to Botswana specifically to seek her out. What could he want from her?