I don't inflict horrors on readers. In my research, I've uncovered truly terrible documentations of cruelty and torture, but I leave that offstage. I always pull back and let the reader imagine the details. We all know to one degree or another the horrors of war.

For John le Carre, it was always who's betraying who: the hall-of-mirrors kind of thing. When you go back to the '30s, it's a case of good vs. evil, and no kidding. When I have a hero who believes France and Britain are on the right side, a reader is not going to question that.

I grew up reading genre writers, and to the degree that Eric Ambler and Graham Greene are genre writers, I'm a genre writer.

I am a historian. I do a lot of research, and I try to get it right.

Le Carre's voice - patrician, cold, brilliant and amused - was perfect for the wilderness-of-mirrors undertow of the Cold War, and George Smiley is the all-time harassed bureaucrat of spy fiction.

The best Paris I know now is in my head.