Now this Happy Bapetsi was intelligent; that was immediately apparent. She also had few worries-this was shown by the fact that there were no lines on her face, other than smile lines of course. So it was man trouble, thought Mma Ramotswe. Some man has turned up and spoilt everything, destroying her happiness with his bad behaviour.

"Let me tell you a little about myself first," said Happy Bapetsi. "I come from Maun, you see, right up on the Oka-vango. My mother had a small shop and I lived with her in the house at the back. We had lots of chickens and we were very happy.

"My mother told me that my Daddy had left a long time ago, when I was still a little baby. He had gone off to work in Bul-awayo and he had never come back. Somebody had written to us-another Motswana living there-to say that he thought that my Daddy was dead, but he wasn't sure. He said that he had gone to see somebody at Mpilo Hospital one day and as he was walking along a corridor he saw them wheeling somebody out on a stretcher and that the dead person on the stretcher looked remarkably like my Daddy. But he couldn't be certain. "So we decided that he was probably dead, but my mother did not mind a great deal because she had never really liked him very much. And of course I couldn't even remember him, so it did not make much difference to me.

"I went to school in Maun at a place run by some Catholic missionaries. One of them discovered that I could do arithmetic rather well and he spent a lot of time helping me. He said that he had never met a girl who could count so well. "I suppose it was very odd. I could see a group of figures and I would just remember it. Then I would find that I had added the figures in my head, even without thinking about it. It just came very easily-I didn't have to work at it at all.

"I did very well in my exams and at the end of the day I went off to Gaborone and learned how to be a bookkeeper. Again it was very simple for me; I could look at a whole sheet of figures and understand it immediately. Then, the next day, I could remember every figure exactly and write them all down if I needed to.

"I got a job in the bank and I was given promotion after promotion. Now I am the No. 1 subaccountant and I don't think I can go any further because all the men are worried that I'll make them look stupid. But I don't mind. I get very good pay and I can finish all my work by three in the afternoon, sometimes earlier. I go shopping after that. I have a nice house with four rooms and I am very happy. To have all that by the time you are thirty-eight is good enough, I think."

Mma Ramotswe smiled. "That is all very interesting. You're right. You've done well."

"I'm very lucky," said Happy Bapetsi. "But then this thing happened. My Daddy arrived at the house."

Mma Ramotswe drew in her breath. She had not expected this; she had thought it would be a boyfriend problem. Fathers were a different matter altogether.

"He just knocked on the door," said Happy Bapetsi. "It was a Saturday afternoon and I was taking a rest on my bed when I heard his knocking. I got up, went to the door, and there was this man, about sixty or so, standing there with his hat in his hands. He told me that he was my Daddy, and that he had been living in Bulawayo for a long time but was now back in Botswana and had come to see me.

"You can understand how shocked I was. I had to sit down, or I think I would have fainted. In the meantime, he spoke. He told me my mother's name, which was correct, and he said that he was sorry that he hadn't been in touch before. Then he asked if he could stay in one of the spare rooms, as he had nowhere else to go.

"I said that of course he could. In a way I was very excited to see my Daddy and I thought that it would be good to be able to make up for all those lost years and to have him staying with me, particularly since my poor mother died. So I made a bed for him in one of the rooms and cooked him a large meal of steak and potatoes, which he ate very quickly. Then he asked for more. "That was about three months ago. Since then, he has been living in that room and I have been doing all the work for him. I make his breakfast, cook him some lunch, which I leave in the kitchen, and then make his supper at night. I buy him one bottle of beer a day and have also bought him some new clothes and a pair of good shoes. All he does is sit in his chair outside the front door and tell me what to do for him next." "Many men are like that," interrupted Mma Ramotswe. Happy Bapetsi nodded. "This one is especially like that. He has not washed a single cooking pot since he arrived and I have been getting very tired running after him. He also spends a lot of my money on vitamin pills and biltong.

"I would not resent this, you know, except for one thing. I do not think that he is my real Daddy. I have no way of proving this, but I think that this man is an impostor and that he heard about our family from my real Daddy before he died and is now just pretending. I think he is a man who has been looking for a retirement home and who is very pleased because he has found a good one."

Mma Ramotswe found herself staring in frank wonderment at Happy Bapetsi. There was no doubt but that she was telling the truth; what astonished her was the effrontery, the sheer, naked effrontery of men. How dare this person come and impose on this helpful, happy person! What a piece of chicanery, of fraud! What a piece of outright theft in fact!

"Can you help me?" asked Happy Bapetsi. "Can you find out whether this man is really my Daddy? If he is, then I will be a dutiful daughter and put up with him. If he is not, then I should prefer for him to go somewhere else."

Mma Ramotswe did not hesitate. "I'll find out," she said. "It may take me a day or two, but I'll find out!"

Of course it was easier said than done. There were blood tests these days, but she doubted very much whether this person would agree to that. No, she would have to try something more subtle, something that would show beyond any argument whether he was the Daddy or not. She stopped in her line of thought. Yes! There was something biblical about this story. What, she thought, would Solomon have done?

MMA RAMOTSWE picked up the nurse's uniform from her friend Sister Gogwe. It was a bit tight, especially round the arms, as Sister Gogwe, although generously proportioned, was slightly more slender than Mma Ramotswe. But once she was in it, and had pinned the nurse's watch to her front, she was a perfect picture of a staff sister at the Princess Marina Hospital. It was a good disguise, she thought, and she made a mental note to use it at some time in the future.

As she drove to Happy Bapetsi's house in her tiny white van, she reflected on how the African tradition of support for relatives could cripple people. She knew of one man, a sergeant of police, who was supporting an uncle, two aunts, and a second cousin. If you believed in the old Setswana morality, you couldn't turn a relative away, and there was a lot to be said for that. But it did mean that charlatans and parasites had a very much easier time of it than they did elsewhere. They were the people who ruined the system, she thought. They're the ones who are giving the old ways a bad name.

As she neared the house, she increased her speed. This was an errand of mercy, after all, and if the Daddy were sitting in his chair outside the front door he would have to see her arrive in a cloud of dust. The Daddy was there, of course, enjoying the morning sun, and he sat up straight in his chair as he saw the tiny white van sweep up to the gate. Mma Ramotswe turned off the engine and ran out of the car up to the house.

"Dumela Rra," she greeted him rapidly. ''Are you Happy Bapetsi's Daddy?"

The Daddy rose to his feet. "Yes," he said proudly. "I am the Daddy."