“That car is far too big,” said Mma Ramotswe. “It is taking up too much room. Soon there will be not enough room in Botswana for the rest of us if these big cars keep coming.”

“Maybe we should have given it a bit more room, Mma,” her assistant said. “I’m not criticising your driving, but it is sometimes a good idea to give big cars a bit more room.”

Mma Ramotswe was having none of that. “You are not a big person just because you have a big car. All people are entitled to the same amount of room.”

That settled, they made their way into the covered walkway between the shops. Halfway along, beside a shop selling clothing, was a shop devoted to tents, mosquito nets, sheath knives, and the other requirements of those setting off into the bush. Mma Ramotswe’s eye was drawn to a stand displaying compasses, and a booklet entitled How Not to Get Lost in the Bush. She picked up the booklet and paged through it. There was a section on how to find north, south, east, and west. She smiled as she read this; it could not have been intended for any local readers. Everybody she knew was fully aware of exactly which way north lay-because that was the direction in which the Francistown Road ran; South Africa was over there, beyond Tlokweng, to the east; Lobatse lay in the south; and to the west was the Kalahari, which anybody with a nose could smell, apart from anything else, because when the wind came from that quarter it was a fragrant mixture of dryness and emptiness and waving grass. But she had to acknowledge that if one did not know these things-and a visitor could hardly be expected to-then this book, with its diagrams and its explanation of how to track the passage of the sun by inserting a stick into the ground, was well worth its eighty-pula cover price.

The assistant approached them, and Mma Makutsi pointed to the boots, which were prominently displayed on a shelf behind the counter. Each woman gave her size, and the appropriate boxes were fetched from a cupboard.

“They will be very comfortable,” said Mma Makutsi. “You will not regret this, Mma.”

Mma Ramotswe was not so sure. She had the distinct feeling that she was being pushed into the purchase of these boots by Mma Makutsi, and she did not think that she could legitimately pass the cost on to the client. She could hardly add to the bill Boots: 600 pula. Any client receiving that would be perfectly within his rights to challenge it, and if it could not be passed on, then she would have to pay it herself.

The assistant returned with boxes tucked under her arm. As the boots were unpacked, Mma Ramotswe noticed something about Mma Makutsi’s expression-a look of anticipation that went far beyond anything one might normally expect. It was the look that one might see on the face of a child about to be given a treat, a look that spoke of sheer, uncomplicated pleasure and excitement. We lose that look, she thought, as we get older; we forget what it is like to be so thrilled. This, then, was the look of a woman who loved shoes.

Mma Makutsi was attended to first. The boots were perfect, she said, and she would take them, or rather Mma Ramotswe would.

The assistant turned to Mma Ramotswe. “Your feet are much bigger,” she said. “These boots might be too small. But let us try, Mma.”

It was a slightly tight fit, but the assistant pointed out that suede gave under pressure and that they would fit perfectly well after a day or two’s use.

“Then we shall take those as well,” said Mma Makutsi. “That is: one pair for me and one pair for this lady. Two pairs.”

Mma Ramotswe threw her a glance. There were times, she thought, when Mma Makutsi forgot that she was an assistant detective, not a director of the agency; ninety-seven per cent notwithstanding, she was her assistant, and assistants did not make the decisions on important purchases. She was not one to put anybody down, and certainly not when Mma Makutsi turned to her to say, “Mma Ramotswe, you have been very kind. There are very few people who are lucky enough to have a boss as generous as you are. This is not just me saying this, Mma; I am speaking from my heart, from here.” And she pointed to her chest, and Mma Ramotswe smiled and thanked her, and told her that she was glad that they were both now well prepared for their trip. “I am very happy, Mma,” she said, which she was, and she was pleased with her new boots too, which she thought made her look quite a bit younger, and made her feel more agile.

She paid the bill, counting out twelve fifty-pula notes that had more or less depleted the office’s petty cash. Then, as they were about to leave the shop, Mma Makutsi took Mma Ramotswe’s arm. “There is a man staring at you,” she said. “Look, out there. Near that bench. He has a familiar face. Who is he, Mma?”

Mma Ramotswe looked through the shop window to the walkway outside. Mr. Herbert Mateleke, part-time reverend, suspected adulterer, was standing in the shade, staring at her. It was almost as if he was following her, as she had earlier on imagined herself following him.

SO, RRA,” Mma Ramotswe said as she came out of the shop. “So, here you are standing, thinking about what to say to the faithful.”

Mma Makutsi now remembered where she had seen this man: he had been on television, talking about a plan to raise one million pula for some ambitious project-a flying-doctor plane, or something of that sort. There were so many people with projects, she thought, and most of them sounded very worthy. But how did one decide where one’s charity would go? It was very difficult. And then the further thought came that she did not give very much-in fact, she gave nothing, even though now she could spare one or two pula, her single-girl’s mite, so to speak. She would start giving one day, after she had received a little bit more herself; then she would give.

Herbert Mateleke laughed. It was a short laugh, though-that of one who had been distracted from something grave, and needed to get back to more serious thoughts. “I was not thinking of higher things, Mma. I was trying to make out whether it was you I saw in the shop. With the light like this, you see, the glass reflects and you cannot see exactly who is on the other side. Now I see it is you.”

“And my secretary, Mma Makutsi. We have been…”

“Assistant detective,” interjected Mma Makutsi, giving Mma Ramotswe a disapproving glance. “We have been buying equipment for a case.”

Herbert Mateleke nodded distractedly. “Yes, of course. You must need a lot of equipment.” He paused, gathering his thoughts for an aphorism. “We need a lot of equipment to find out the truth in this world.”

Mma Ramotswe raised an eyebrow. “Do you think so, Rra? I think that all we need in order to know the truth is these.” She pointed to her eyes. And then, pointing to her nose, “And this. This is a very big help in finding out what is true and what is not. Don’t you agree, Rra?”

There was no edge to what she said, but as she spoke to Herbert Mateleke she could not forget the fact that, at least in his wife’s eyes, he stood accused of having an affair. And that shirt-that bright blue shirt-was that the sort of shirt one expected a successful businessman and part-time reverend to wear? Or was it the shirt of a man who was trying to make himself a little bit more colourful, rather more interesting to women? She knew the warning signs with middle-aged men-they were like a set of traffic lights that glowed brightly in the dark. Greater attention to personal grooming? Bad sign. Pulling-in of the stomach to conceal paunch? Bad sign. Purchase of a more powerful car in bright red? Very, very bad sign.

Of course, the shirt could be interpreted in various ways. It was a loose-fitting, open-neck shirt of the sort worn by Nelson Mandela. Such shirts were not tucked into one’s trousers, but hung about the waist, allowing for air to circulate. They suited older men very well, those on whose physique prosperity, and particularly a diet of good Botswana beef, might have taken its toll, and they were perfect, of course, for Mr. Mandela himself, who lent them that grace and dignity that came so naturally to him. You might conclude, thought Mma Ramotswe, that Mr. Mateleke was wearing this shirt because it was comfortable and paid tribute, perhaps, to that most gracious of men who had popularised the style. Or you might conclude that here was a man who was paying attention to his clothes because he was having an affair. You might reach for either of these conclusions, but if you were a detective, and you had been approached by the wife of the man in question, who had given voice to her own suspicions, then you would be excused, surely, for reaching the second, less charitable of these conclusions.