They made a circuit of the floor — she danced perfectly, as he would have expected — and then she said, bluntly: "What are you doing here, Saint?"

"Treading the light fantastic, drinking free champagne, and watching little monkeys scrambling up the social ladder," he answered airily. "And you?"

"I'm here for exactly the same reason as you are — my old age pension."

"I can't imagine you getting old, Kate."

"Let's sit out somewhere," she said suddenly.

They left the ballroom and went in search of a secluded corner of the conservatory, where there were armchairs and sheltering palm trees providing discreet alcoves for romantic couples. Simon noticed that the girl was quite sure of her way around, and said so.

"Of course I've been here before," she said. "I expect you have, too."

"On the contrary — this is my first visit. I never take two bites at a cherry."

"Not even a five thousand pound one?"

"Not even that."