“It is not easy for me either,” the older woman said. “Just because I am a bit older than you does not mean that I have the answer to every dilemma that comes along. As you get older, in fact, you see more sides to a situation. Things are more clear-cut at your age.” She paused, then added: “Mind you, remember that I am not quite forty. I am not all that old.”

“No,” said Mma Makutsi. “That is just about the right age for a person to be. But this problem we have; it is all very troubling. If we tell Badule about this man and he puts a stop to the whole thing, then the boy’s school fees will not be paid. That will be the end of this very good chance that he is getting. That would not be best for the boy.”

Mma Ramotswe nodded. “I see that,” she said. “On the other hand we can’t lie to Mr Badule. It is unethical for a detective to lie to the client. You can’t do it.”

“I can understand that,” said Mma Makutsi. “But there are times, surely, when a lie is a good thing. What if a murderer came to your house and asked you where a certain person was? And what if you knew where that person was, would it be wrong to say: ‘I do not know anything about that person. I do not know where he is.’ Would that not be a lie?”

“Yes. But then you have no duty to tell the truth to that murderer. So you can lie to him. But you do have a duty to tell the truth to your client, or to your spouse, or to the police. That is all different.”

“Why? Surely if it is wrong to lie, then it is always wrong to lie. If people could lie when they thought it was the right thing to do, then we could never tell when they meant it.” Mma Makutsi, stopped, and pondered for a few moments before continuing. “One person’s idea of what is right may be quite different from another’s. If each person can make up his own rule …” She shrugged, leaving the consequences unspoken.

“Yes,” said Mma Ramotswe. “You are right about that. That’s the trouble with the world these days. Everyone thinks that they can make their own decisions about what is right and wrong. Everybody thinks that they can forget the old Botswana morality. But they can’t.”

“But the real problem here,” said Mma Makutsi, “is whether we should tell him everything. What if we say: ‘You are right; your wife is unfaithful,’ and leave it at that? Have we done our duty? We are not lying, are we? We are just not telling all the truth.”