An English journalist called Michael Viney told me when I was 25, that I would write well if I cared a lot what I was writing about. That worked. I went home that day and wrote about parents not understanding their children as well as we teachers did, and it was published the very next week.

If you write what you know about, you will always be on safe ground. I am very edgy and nervous about going into territories I know nothing about. That's why you don't find much high finance, group sex, or yachting parties in my stories.

The great thing about getting older is that you become more mellow. Things aren't as black and white, and you become much more tolerant. You can see the good in things much more easily rather than getting enraged as you used to do when you were young.

You can't lay down laws for what people think and hope.

I love thriller writers. My favourites are Harlan Coban, Lee Child, Ian Rankin, Kathy Reichs and Ed McBain.

I was the big, bossy older sister, full of enthusiasms, mad fantasies, desperate urges to be famous, and anxious to be a saint - a settled sort of saint, not one who might have to suffer or die for her faith.

I believed that old people never laughed. I thought they sighed a lot and groaned. They walked with sticks, and they didn't like children on bicycles or roller skates or with big dogs.