Changing from biochemistry to law was easy because I was rubbish in the laboratory. I could never decide how much to put in a test tube because I'm not very good at maths.
My novel 'Wolf Brother' is set in northern Scandinavia during the late Stone Age, so I was aware from the start of Norse influences. I used some Norse names, and the soul-eater Thiazzi is based on the Norse storm giant, Thiassi.
For a novelist, the great thing about the Stone Age people is that we know virtually nothing about their beliefs - which means that I get to make it up! But it's still got to be plausible.
Why do so many children love the idea of being snowed in or shipwrecked, of having to survive on one's own? When I was a child, I was no exception. I wanted to hunt with a bow and arrow like the Stone Age people: to skin deer and build my own shelter. And I desperately wanted a wolf. As we lived in London, my options were limited.
I wanted to write a very simple story about a boy, a wolf, a girl, a bear and a forest, so I thought I might set it in the past. I didn't realise that it went back to when I was 10: I used to love the Stone Age when I was a kid and wanted to live in it, and I got rid of my bed and slept on the floor, but I didn't remember it.
When my father was diagnosed with terminal cancer in 1991, I asked him if he had any regrets, and he said no. I was a burnt-out litigation solicitor in my thirties, hating my life, and his cancer made me re-evaluate it all.
