“I think that she still wants to be a mechanic. Mr. J.L.B. Matekoni talks to her about cars and she is always asking him about gearboxes and such things. There are not many girls who talk about engines, but she is one.”

“That will also be a very good thing,” said Mma Makutsi. “It means that there will be a Tlokweng Road Speedy Motors even in twenty years’ time, when you and Mr. J.L.B. Matekoni are both late.”

Mma Ramotswe did a quick calculation in her head. “I do not think that either of us need be late by then, Mma,” she said. “We are not that old.”

Mma Makutsi looked doubtful. “Maybe not,” she admitted, rather reluctantly, thought Mma Ramotswe.

MANY HOURS and many stories later they reached Maun. It was early evening, and they saw in the distance the first lights of the town in the gathering dusk. There was something deeply reassuring about the sight. It was not simply that they were reaching the end of their long journey; the lights were comforting signs of human settlement in a great emptiness. To the south, under a sky that, as the evening approached, became an expanse of red, were the Makadikadi salt pans, a landscape of improbable whiteness that went on for a hundred miles, forever, it seemed, if one stood on their edge, a tiny human. Mma Ramotswe shivered: to stand on the verge of something so great and so empty seemed to be in danger of being swallowed up; she often felt that when she was in the wild places of her country. It would be so easy to become lost, to disappear, to find yourself alone in a wide slice of Africa, reduced to what you really were, a small and vulnerable creature among many other creatures.

The lights drew nearer. Now they were individual dwellings, dotted here and there amid the acacia scrub. A few had fires outside, small flickering points of orange seen through the trees. A truck, a figure, a set of headlights in the darkness; and then Maun itself, with its streets and lit windows, and its frontier air.

Mma Makutsi looked out of her window. “So this is the place,” she said. “So this is it.”

“Yes,” said Mma Ramotswe. “We must find Mr. J.L.B. Matekoni’s cousin’s place now.”

That, as it happened, was not easy. They took directions from a man they saw standing at the side of the street, near one of the hotels. He sent them off into the night in entirely the wrong direction, or so they were told by the next person from whom they obtained guidance. He was more reliable, and they eventually found the house half an hour after they had arrived in the town.