Dennis Lehane (Mystic River, Shutter Island, Gone, Baby, Gone) is one of my favorite contemporary novelists. He told the Irish Times what it was like writing about paedophilia in Mystic River:
I hated being in there, I hated it. Climbing around in that head, it was awful. But Mystic River was looking at a tragedy in which the victim is the hero. The hero of the story is Boyle, because it’s in him. He won’t act on it, but it’s clearly in him. So he does this sideways move where he sees this guy with a child, and he beats the guy because he wants the child. That’s the secret of the book.
So, writing that story, I had to get into the head of a guy who’s attracted to a child. There were days and days and days when I would write certain Dave Boyle scenes and I would be wrecked afterwards, ruined. I just couldn’t work, couldn’t function. All I could do was eat and sleep for days on end.
I've avoided certain projects because I just don't want to live in them for an extended period. Some years ago I was interviewed regarding writing a book in collaboration with a woman who had undergone a horrendous experience--she was kidnapped, raped, forced to take drugs and take part in a crime and arrested before eventually being cleared. The producer interviewing me noticed before I did that I really didn't want to spend six months re-living those experiences with her and I didn't get the job--fortunately!
Lehane also talked about how his preoccupations color his fiction, as in the gothic surrealism of Shutter Island:
I knew when I was writing it that the political thing was there, and I told myself, don’t even write to it. Just know it’s there, and play with it as much as you can, when you can. I guess I was so angry about the Patriot Act and all this fear-mongering that came in after 9/11, and I just said, ‘This is a new McCarthyism, we’re swimming in it. If you want to call it anything else, you’re bulls***ting yourself. And what happens when you start to watch what you say? Ultimately you start to watch what you think. And you start a systematic breakdown of the freedom of your own mind. And that’s what I wanted to play with. That’s what I was doing.
Lehane's newest is Moonlight Mile, featuring the same pair of investigators as in Gone, Baby, Gone and three of his other novels. I've just bought it and am looking forward to reading it.