It was when I realised I had a new nationality: I was in exile. I am an adulterous resident: when I am in one city, I am dreaming of the other. I am an exile; citizen of the country of longing.

A city like Bombay, like New York, that is a recent creation on the planet and does not have a substantial indigenous population, is full of restless people. Those who have come here have not been at ease somewhere else. And unlike others who may have been equally uncomfortable wherever they came from, these people got up and moved. As I have discovered, having once moved, it is difficult to stop moving.

The great thing about Bombay is its open, generous heart. I hope - I know - that this spirit will endure. Bombay will adjust.

Each person’s life is dominated by a central event, which shapes and distorts everything that comes after it and, in retrospect, everything that came before.

And at the moment of contact, they do not know if the hand that is reaching for theirs belongs to a Hindu or Muslim or Christian or Brahmin or untouchable or whether you were born in this city or arrived only this morning or whether you live in Malabar Hill or New York or Jogeshwari; whether you’re from Bombay or Mumbai or New York. All they know is that you’re trying to get to the city of gold, and that’s enough. Come on board, they say. We’ll adjust.

Commuter trains are the easiest target for terrorists, as we have seen in Madrid, London, and now Bombay. But it is difficult for a Westerner to comprehend the kind of overcrowding in a Bombay local train; they ferry six million passengers a day. A bomb that goes off in one of those compartments will have maximum impact.

While I was writing my book, I got a top police official in Bombay an invitation to study terrorism at the Rand Institute in Washington DC. This would have helped the city enormously, as he was the detective who cracked the '93 blasts case. But the commissioner declined to let his subordinate take up the offer from Rand, because of his fear that it was CIA-affiliated. That culture of suspicion needs to change; India needs to learn how other democracies fight terror.