It takes me three or four years to research and write each book and the individual stories stay with you for a long time afterwards.
I just write the sort of book that I would enjoy reading myself, a book that is both scholarly and recreates the experience of people at that time.
I believe passionately in preemptive pessimism, especially before a book comes out. I expect the worst both from reviewers and sales, and then, with any luck, I may be proved wrong.