Right at the end of the war I wrote a piano sonata, which was written at a time when Sam Barber used to come down here and we used to have lunch together in a very nice old hotel that's now not there.
Once a novel gets going and I know it is viable, I don't then worry about plot or themes. These things will come in almost automatically because the characters are now pulling the story.
It can be rebuilt if other countries with selfish interests will not meddle, as has been done in the past.