Sorrow can be a bully.

In Germany, you have a huge official memorial to the murdered Jews and then you have this artist who's been putting these stumbling blocks, these brass cobblestones, outside the houses Jews were taken away from. It's somewhat controversial and has met some resistance.

I had been a reporter for 15 years when I set out to write my first novel. I knew how to research an article or profile a subject - skills that I assumed would be useless when it came to fiction. It was from my imagination that the characters in my story would emerge.

I read Claire Messud's 'The Emperor's Children,' I read Joseph O'Neill's 'Netherland' - but to me, they're not 9/11 novels. In 'The Emperor's Children,' 9/11 felt to me like a piece of the plot; the novel wasn't wrestling with what 9/11 meant. And 'Netherland' felt the same way. I liked both books a lot but I don't see them as 9/11 novels.

Work less than you think you should. It took me a while to realise there was a point each day when my creativity ran out and I was just producing words - usually lousy ones - for their own sake. And nap: it helps to refresh the brain, at least mine.

While researching 'The Submission,' I went to a protest against the Ground Zero mosque in New York when I was about to give birth to twins. It was about 100 degrees. People thought I was very dedicated.

As a novelist, you deepen your characters as you go, adding layers. As a reporter, you try to peel layers away: observing subjects enough to get beneath the surface, re-questioning a source to find the facts. But these processes aren't so different.