Isabel is looking at several collections of research journals. 'She would understand the issues if she chose to open one of the volumes, but she knew that there were conversations within which she would never have the time to participate in. And that, of course, was the problem with any large collection of books, whether in a library or a bookshop: one might feel intimidated by the fact that there was simply too many to read and not know where to start.

Now the tea began to do its work- as it always did- and the world that only a few minutes previously had seemed so bleak started to seem less so.

I think people in Botswana are pleased that my books paint a positive picture of their lives and portray the country as being very special. They've made a great success of their country, and the people are fed up with the constant reporting of only the problems and poverty of the continent. They welcome something which puts the positive side.

Every single day, I get letters - very moving, overwhelming letters - testifying how much my books have meant to people in times of crisis in their lives, when they were very ill, say. If I ever doubted that writing could play an important part in people's lives, I don't doubt that now.

My Botswana books are positive, and I've never really sought to deny that. They are positive. They present a very positive picture of the country. And I think that that is perfectly defensible given that there is so much written about Africa which is entirely negative.