I think that books for young people should have serious and important themes, they shouldn't be trivial. So the books I write, they would be the kind of stories you would write in an adult novel only they just happen to feature a child at the center of them.

Bruno: "Why do you wear pajamas all day?" Shmuel: "The soldiers. They took all our clothes away." Bruno: "My dad's a soldier, but not the sort that takes people's clothes away."

I can't bear to be on a train without a book", she announced. " It's a form of self-defence in a way" .

Bruno: We're not supposed to be friends, you and me. We're meant to be enemies. Did you know that?

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.

It's not easy making a living as a writer, and for many years I worked at a Waterstones in Dublin. It was a good environment for an aspiring writer, with lots of events and authors appearing.

I started reading Dickens when I was about 12, and I particularly liked all of the orphan books. I always liked books about young people who are left on their own with the world, and the four children's books I've written feature that very thing: children that are abandoned by their families or running away from their families or ignored by their families and having to grow up quicker than they should, like David Copperfield - having to be the hero of their own story.