The afternoon before i left London for New York—Rachel had flown out six weeks previously—I was in my cubicle at work, boxing up my possessions, when a senior vice-president at the bank, an Englishman in his fifties, came to wish me well. I was surprised; he worked in another part of the building and in another department, and we were known to each other only by sight. Nevertheless, he asked me in detail about where I intended to live (“Watts? Which block on Watts?”) and reminisced for several minutes about his loft on Wooster Street and his outings to the “original” Dean & DeLuca. He was doing nothing to hide his envy.

“We won’t be gone for very long,” I said, playing down my good fortune. That was, in fact, the plan, conceived by my wife: to drop in on New York City for a year or three and then come back.

“You say that now,” he said. “But New York’s a very hard place to leave. And once you do leave . . .” The S.V.P., smiling, said, “I still miss it, and I left twelve years ago.”

It was my turn to smile—in part out of embarrassment, because he’d spoken with an American openness. “Well, we’ll see,” I said.

“Yes,” he said. “You will.”

His sureness irritated me, though principally he was pitiable—like one of those Petersburgians of yesteryear whose duties have washed him up on the wrong side of the Urals.

But it turns out he was right, in a way. Now that I, too, have left that city, I find it hard to rid myself of the feeling that life carries a taint of aftermath. This last-mentioned word, somebody once told me, refers li...