Mma Ramotswe almost said: But we shall not, Mma Makutsi, because evolution takes a long time, and you and I shall not be around to see the results. But she did not, because Mma Makutsi's remarks had struck a chord within her and she wanted to think about them a bit more. When had she herself last walked any distance at all? It was sobering to realise that she could not remember. She usually went for a walk around her garden shortly after dawn—and sometimes in the evenings as well—but that was not very far, and she often spent more time looking at plants, or standing and thinking, than walking. And for the rest, she used her tiny white van, driving in it each morning to the No. 1 Ladies' Detective Agency and then driving home again at the end of the day. And if she went to the shops at River Walk, to the supermarket where there had been that dramatic chase with shopping carts, she drove there too, parking as close to the entrance as she could, so that she did not have a long walk across the car park. No, she was as good an example as anybody of what Mma Makutsi had been talking about. And so was Mma Potokwane, the matron of the orphan farm, who drove everywhere in that old van that they used to transport the children; and Mr. J.L.B. Matekoni, too, who was even more implicated in this epidemic of laziness, given that he fixed cars and vans and thereby enabled people to avoid walking.

No, Mma Makutsi was right, or, even if she was not entirely right, was a bit right. Cars had changed Botswana; cars had changed everywhere, and Mma Ramotswe was not at all sure that this change was entirely for the better.

I shall start walking a bit more, she resolved. It is not enough just to identify a problem; there were plenty of people who were very skilled at pointing out what was wrong with the world, but they were not always so adept at working out how these things could be righted. Mma Ramotswe did not wish to be one of these armchair critics; she would do something. She would start walking to work on … she almost decided on three days of each week, but then thought that two days would be quite enough. And she would start tomorrow.

On the way home that evening, the idea of walking came back to Mma Ramotswe. The idea returned, though, not because she remembered what Mma Makutsi had said about laziness, but because the tiny white van, which in the past few months had intermittently been making a strange noise, was now making that noise again, but louder than before. It happened as she made her way into Zebra Drive; turning a corner always put a strain on the tiny white van, which was something to do with the suspension and what Mr. J.L.B. Matekoni referred to politely as the “distribution of load.” Mma Ramotswe had pondered this expression and then asked, perhaps rather bluntly, “And the load, I take it, Mr. J.L.B. Matekoni, is me?”