“So we decided to bury the body and to say that we knew nothing about it. I knew that there were anthills nearby; the bush there is full of them, and I knew that this was a good place to get rid of a body. I found one quite easily, and I was lucky. An anteater had made quite a large hole in the side of one of the mounds, and I was able to enlarge this slightly and then put the body in. Then I stuffed in stones and earth and swept around the mound with a branch of a thorn tree. I think that I must have covered all traces of what had happened, because the tracker that they got in picked up nothing. Also, there was rain the next day, and that helped to hide any signs.

“The police asked us questions over the next few days, and there were other people, too. I told them that I had not seen him that evening, and Carla said the same thing. She was shocked, and became very quiet. She did not want to see me anymore, and she spent a lot of her time crying.

“Then Carla left. She spoke to me briefly before she went, and she told me that she was sorry that she had become involved with me. She also told me that she was pregnant, but that the baby was his, not mine because she must already have been pregnant by the time she and I started seeing one another.

“She left, and then I left one month later. I was given a scholarship to Duke; she left the country. She did not want to go back to South Africa, which she didn’t like. I heard that she went up to Zimbabwe, to Bulawayo, and that she took a job running a small hotel there. I heard the other day that she is still there. Somebody I know was in Bulawayo and he said that he had seen her in the distance.”

He stopped and looked at Mma Ramotswe. “That is the truth, Mma,” he said. “I didn’t kill him. I have told you the truth.”

Mma Ramotswe nodded. “I can tell that,” she said. “I can tell that you were not lying.” She paused. “I am not going to say anything to the police. I told you that, and I do not go back on my word. But I am going to tell the mother what happened, provided that she makes the same promise to me—that she will not go to the police, and I think that she will give me that promise. I do not see any point in the police reopening the case.”

It was clear that Dr Ranta was relieved. His expression of hostility had gone now, and he seemed to be seeking some sort of reassurance from her.

“And those girls,” he said. “They won’t make trouble for me?”