With the adult ones, I feel I need to get as deep inside the psychology of a character as I can, and that needs to be first-person. In the children's books, I feel I need some distance. I don't want to be the nine-year-old at the center of the story. I need to have some type of narrative voice.

I hope for so much from every book I read. And time and again, I find myself disappointed. I look across my bookshelves and see hundreds of titles which in my memory seem merely mediocre or second-rate. Only occasionally does a novel appear for which I feel a lasting passion, a book that I think could in time become a classic.

Children's book writers tend to feel quite superior, and adult writers tend to feel they wouldn't know how to write a children's book - which might surprise you because I think a lot of people think it's the other way around.

Do you see the irony at all, Tristan?’ I stare at him and shake my head. He seems determined not to speak again until I do. ‘What irony?’ I ask eventually, the words tumbling out in a hurried heap. ‘That I am to be shot as a coward while you get to live as one.

I like reading books about kids where there weren't really many adults, where they didn't need an adult to come and solve the problems for them. They could use their own ingenuity, use their own talents to solve whatever the issue was. And I like that still. I think that children want to read about heroic children. They don't want to read about children that have to be saved all the time.

The dot that became a speck that became a blob that became a figure that became a boy

I was a very quiet child, quite introverted, really. Independent, yes; I didn't need a lot of supervision. Less so than I did when I got older, maybe. But I was a bookish child, not surprisingly. I could sit quite happily in a corner for hours and entertain myself with books.