Genes are not simple triggers. No one is hardwired to commit murder or any other crime. Our actions are always the result of stupendously complex gene-environment interactions, and environment is likely to remain the more important influence by far.

When I was 30 or so - by that time I had become an assistant D.A. - I decided I would try to write a novel. To be clear: I did not decide to become a novelist. Honestly, it never crossed my mind that I could actually earn a living as a professional novelist.

I don't ever write with a particular audience in mind. I just write books that please me.

I'm a bit of a tech geek myself.

I love sports, as all Bostonians seem to. I love books and movies, as all writers seem to.

But sometimes you can't figure everything out because you can't ever really understand other people. You can't understand why they do what they do. You just have to accept a little mystery, Ben. People are mysterious, the world is mysterious. You can't know everything. You're not supposed to. This isn't a history book. It's just the world. It's a messy place.

At some point as adults we cease to be our parents' children and we become our children's parents instead.