The Saturday Big Tent Wedding Party by Alexander McCall Smith

Private detective Precious Ramotswe is stumped by her latest case. A farmer, Botsalo Moeti, wants Mma Ramotswe to find out who killed two of his cattle. After several interviews, she's not sure who's telling the truth--including her client. Drama then arrives at the detective agency when Mma Ramotswe and her assistant, Mma Grace Makutsi, discover that one of the apprentices at the adjoining business, Tlokweng Road Speedy Motors, is the father of twins. In addition, Mma Makutsi is deep in the final planning for her wedding, which will happen in a few weeks time. To top it off, both Mma Ramotswe and Mma Makutsi are both convinced that they've seen Mma Ramotswe's dearly beloved departed white van driving around Gaborone. Could this be true or have they seen a ghost?