I started out when I was 29 - too young to write novels. I was broke. I was on unemployment insurance. I was supposed to be writing a Ph.D. dissertation, so I had a typewriter and a lot of paper.
Poland is a wildly dramatic and tragic story. It's just unbelievable what went on with those people. How they survive, I don't really know. The Germans had a particular hatred for the Poles; they really considered them subhuman Slavs, and they were very brutal to them.
I've evolved in my writing to tell a more emotional story - my publisher, Random House, has urged that.
Spy novels are traditionally about lone wolves, but how many people actually live like that?
When I read period material - and it ain't on Google - I am always alert for that one incredible detail. I'll read a whole book and get three words out of it, but they'll be three really good words.
I'm basically an Upper West Side Jewish writer.