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've always written. At the age of six or seven, I would get sheets of A4 paper and fold them in half, cut the edges to make a little eight-page booklet, break it up into squares and put in little stick men with little speech bubbles, and I'd have a spy story, a space story and a football 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.

His eyes beheld beauty not in reality but in the printed word. Standing in the waiting-room, he realized that in his life he had accepted secondary experience -- the experience of reading someone else's thoughts -- over real life.

War created bizarre allies, while peace itself could be divisive.

A lot of writers, especially crime writers, have an image that we think we're trying to keep up with. You've got to be seen as dark and slightly dangerous. But I'm not like that and I've realised that I don't need to put that on. People will buy the books whether they see a photo of you dressed in black or not.

I still think most writers are just kids who refuse to grow up. We're still playing imaginary games, with our imaginary friends.