I am frustrated by celebrities who decide to write children's books because they think it's easy. That drives me crazy. It's frustrating because it's unfair to children. Because they'll get a lot of attention, they'll get a lot of marketing budget and so on just because they're a celebrity - the Madonnas, the Ricky Gervaises, the Russell Brands.

I don't buy into the idea that an Irish writer should write about Ireland, or a gay writer should write about being gay. But when I found the right story, I saw it as an opportunity to write about being a teenager and being gay. Most people, whether you're gay or straight or whatever, have experienced that relationship where one person is much more interested than the other.

. . .only the victims and survivors can truly comprehend the awfulness of that time and place; the rest of us live on the other side of the fence, staring through from our own comfortable place, trying in our own clumsy ways to make sense of it all.

And I have tried to forget him, I have tried to convince myself that it was just one of those things, but it’s difficult to do that when my body is standing here, eight feet deep in the earth of northern France, while my heart remains by a stream in a clearing in England where I left it weeks ago.

What exactly was the difference? he wondered to himself. And who decided which people wore the striped pajamas and which people wore the uniforms?

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.