The most difficult part of any crime novel is the plotting. It all begins simply enough, but soon you're dealing with a multitude of linked characters, strands, themes and red herrings - and you need to try to control these unruly elements and weave them into a pattern.

I think writers have to be proactive: they've got to use new technology and social media. Yes, it's hard to get noticed by traditional publishers, but there's a great deal of opportunity out there if you've got the right story.

Witches never existed, except in people’s minds. All there was in the olden days was women and some men who believed in herbal cures and in folklore and in the wish to fly. Witches? We’re all witches in one way or another. Witches was the invention of mankind, son. We’re all witches beneath the skin.

I'm often asked how I write books, but I don't think my approach is suitable for everyone. If I walked into a creative writing class, all I could say to them was 'I tend to make it up as I go along.' I'm not sure that's brilliant advice.

It was the laughter of birthdays, of money found in an old pocket.

Was it all inevitable, John?" Reeve was pushing his fingers across the floor of the cell, seated on his haunches. I was lying on the mattress. Yes," I said. "I think it was. Certainly, it's written that way. The end of the book is there before the beginning's hardly started.

I used to think that: whenever I heard that someone had taken 10 years to write a novel, I'd think it must be a big, serious book. Now I think, 'No - it took you one year to write, and nine years to sit around eating Kit Kats.