Anyway, over to Julie:
Kate Hardy has many extraordinary and wonderful characteristics, but my favourite is this: when you mention something to her that is a little bit out of the ordinary, a little bit weird (particularly if it involves ice cream, chocolate or coffee), her eyes get all big. She stares out somewhere beyond you, somewhere exciting and fascinating. She is seeing incredible things in her mind. Her expression of wonder is such that you're tempted to turn your head to check if there's something amazing going on behind your back. But there's nothing there.
She says, slowly, and with a particular relish to her words:
"I can use that in a story."
And you know that Kate's next book, or maybe the book after that, will include something strange and interesting, something that she's researched intensively and that has given her story its own particular, special flavour.

This was pretty, but not particularly interesting in itself. What was interesting at the moment that I happened to look up, was that the rainbows shone directly on Nelson's crotch. And the crotches of his compatriots.
Of course this was too good to keep to myself so I ran from table to table, pointing it out. Kate, who shares my sense of humour, immediately took a photo. And I turned to her and said, "I can use that in a story."

None of this is as easy as it sounds, mostly because in 1814, she's distracted by the gorgeous, wealthy, chivalrous owner of the house, James Fitzwilliam. And in her real life, she's distracted by her feckless, annoyingly sexy artist ex-husband Leo Allingham, who has returned unexpectedly from America.
It's Alice who notices that at around two o'clock on every sunny day in Eversley Hall, the light reflects off the chandelier and projects a rainbow directly onto the crotch of an oil painting of James Fitzwilliam. She writes about it in her magazine, and the rainbow becomes a tourist attraction all of its own.
It was a fun scene to write, but the oil painting and the rainbow also began to take on greater significance for me. It was something temporary projected onto something permanent, and a lot of SUMMER is about how even things that are past leave permanent traces. Alice and Leo have a tragic secret in their past, one that they never talk about, but which has changed them forever. The rainbow also functions like a sundial, and the book is about taking time to heal, time to think, time to discover who you really are.
Writing can transform something temporary into something permanent, and something merely interesting into something special and new. Kate does this all the time in her books, and I'm proud that sometimes, she and I have that in common.
I'll give away a paperback of THE SUMMER OF LIVING DANGEROUSLY to a commenter below. You can talk about rainbow crotches, or whatever you like, really.
And CONGRATULATIONS, KATE, for 50 books!
Julie's website is http://www.julie-cohen.com and she's on Twitter far too much as @julie_cohen. Her next book, DEAR THING, will be out in hardback in April 2013.