Miles was still mourning the loss of his Romantic Plan. 'There was going to be champagne, and oysters, and you' - he held out both hands as though shifting a piece of furniture - 'were going to be sitting there, and I was going to get down on one knee, and...and...

But that initial, comet-blazing-across-the-sky, Big Idea is only the beginning. Each book is composed of a mosaic of thousands of little ideas, ideas that invariably come to me at two in the morning when my alarm is set for seven.

Love doesn't attack; it infiltrates.

It was the usual sort of academic battle: footnotes at ten paces, bolstered by snide articles in academic journals and lots of sniping about methodology, a thrust and parry of source and countersource. My sources had to be better.

Gentlemen do so appreciate a nicely trimmed décolletage.

It is a truth universally acknowledged that one only comes up with clever, cutting remarks long after the other party is happily slumbering away.

I know historians aren't supposed to fall in love with their own theories, but I was head over heels about the notion of an entire band of female French agents, like a nineteenth-century Charlie's Angels. Only better. It made the Pink Carnation's organization look positively humdrum.