The vision returned to Henry Walker and Pretty Poison drinking their tea in the Willow Tree. And after such an intense ride, I think all of us were glad of the break. We watched as Walker freshened Pretty Poison's cup. He always was a gentleman.

"That was all a long time ago," Walker said, in answer to some unheard comment. "We were all different people then."

"Did you ever find out exactly what it was that crashed your Working?" said Pretty Poison, sipping her tea with style and grace.

"No more questions," said Walker. "I've already told you far more than I should. Why are you here, Sophia?"

She smiled at him over her cup. "There are those who say John's mother is coming back."

"Then God help us all."

"Why would she be coming back now, Henry? What is her connection with John's current case?"

For a moment I thought Walker would just order her to leave, or even summon his people and have her dragged away, but the strength seemed to seep right out of him, as though he'd been carrying the burden for far too long and just didn't care any more. He sat back in his chair, looking suddenly old as well as tired, and his eyes were lost in yesterday.

"Mark set it all in motion," he said finally, his voice flat, almost empty. "Back when he introduced Charles to his wife-to-be. I prefer, however, to believe he didn't really know what he was doing. That he was being ... used. By then, he was the Collector. Revered, or despised, depending on whom you talked to. Charles was a research specialist, almost a hermit. He called Mark, in his capacity as the Collector, looking for a research assistant to help him in his very narrow field. (Was that Charles's idea, I wonder, or did some Voice whisper in his ear?) By that time, Charles was investigating the beginnings of the Nightside, using all the money he'd made to fund his new obsession. Mark consulted with various experts, for an exorbitant fee, and finally presented Charles with a young lady called Fennella Davis. An up-and-coming young scholar with an excellent reputation, pretty and bright and articulate, and also very interested in the origins of the Nightside. Soon enough, she and Charles were in love, then they were married."

Walker frowned into his empty cup but made no move to refill it. "Poor Charles. He didn't understand that he was just a means to an end. Charles wasn't the point. John was the point."

"How do you mean?" said Pretty Poison, leaning forward. "What is it that makes John so important?"

"I remember when he was bom," said Walker, not looking at her. "I'd never seen Charles so happy. He spent less and less time on his private work and more and more time with his new family. He stopped being a hermit and embraced life. He accepted new research commissions and rebuilt his reputation as a scholar all over again, with Fennella's help. He and I and Mark became reconciled again, friends again, after so many years. We were older, and perhaps a little wiser, and we were ... happy again.