Paul Auster has the key to the city. He has not, as far as I know, been presented with the literal object, traditionally an oversized five-pound gold-plated item, dispensed to visiting benefactors and favored natives on a dais in front of City Hall by a functionary in top hat and claw hammer coat, but I doubt he needs one of those. Auster’s key is like the key to dreams or the key to the highway. It is an alchemical passe-partout that allows him to see through walls and around corners, that permits him entry to corridors and substrata and sealed houses nobody else notices, as well as to a field of variegated phenomena once considered discrete, but whose coherence Auster has established. This territory is a realm within New York City, a current that runs along its streets, within its office buildings and apartment houses and helter-skelter through its parks—a force field charged by synchronicity and overlap, perhaps invisible but inarguably there, although it was never identified as such before Auster planted his flag.

Auster’s characters peregrinate along this corridor as if it were a moving sidewalk, or like the dream subway devised by the cartoonist Ben Katchor, which stops in individual apartments. Quinn, in City of Glass, and Blue, in Ghosts, both stumble into it, to their enlightenment and discomfiture, and the unseen Fanshawe, in The Locked Room, has gone to live there—the question is whether any of them is able to emerge from it. If you have spent time in New York City and fully engaged with the place, chances are that you will have caught glimpses of that space-time continuum. You will have noticed certain cryptic graffiti, certain glossolaliac manifestos crammed onto photocopied sheets that you did not understand because they were written in the language of that slipstream. You will have wondered about various street characters—itinerant performers and site-specific eccentrics and inexplicable middle-of-the-night apparitions—who are, it turns out, commuters from that realm into the workaday world. But it may be, in fact, the essence of the city, while what passes for the city in the average experience is nothing more than a thin coat of paint.

Auster’s characters know that you can practice a form of divination by reading the sidewalks, that capricious telephone calls can link people in ways that may seem random but end up sealing their fates, that you can pass through the streets completely unseen while making no special effort to disguise yourself or hide, that you can pass through your life in the city without leaving any more of a mark than if you had never been born, that you probably have a double out there somewhere among the eight million whose life runs such a close parallel to yours that the lines never converge—although if they ever do: beware. These things prove that the city has been around for millennia, although it was not always located at the mouth of the Hudson River, or even in North America. It was not even always a city. For a long time it was known as a forest. It was, in fact, the primeval forest, inhabited by trickster foxes and stolid pigs and woebegone wolves and the occasional shape-shifting human, but it was recognizably the same labyrinth of chance.

The chief difference between Auster’s city and that forest is that the trees have become buildings and their leaves have become paper. The paper is covered with writing and gathered into manuscripts and notebooks, of preference red. Some of these are eventually transubstantiated into printed books, but often they subsist as manuscripts and notebooks, which usually find a readership of one besides their authors. Their contents are often cryptic, often coded, sometimes dull, sometimes so disturbing that their readers cannot responsibly give an account but can respond only by destroying them. Those manuscripts and notebooks that cannot be published usually have the deepest connection with the truth, and that truth is either arcane and difficult to perceive or else it is painful enough to be considered an abomination.

Fates pivot on these unread texts, which are in each case the focus or the result of an inquiry by a metaphysical detective. These detectives may bear a superficial or circumstantial resemblance to the classic detectives of the eponymous genre of fiction—about the same kind of resemblance that those characters in turn have to actual workaday investigators—but in essence Auster’s detectives are pilgrims, questers. They would be more immediately recognizable in the forest, striding along with staff in hand and bindle on back, maybe whistling to keep the shadows at bay. And like the blameless pilgrim who ventures forth into the forest with resolve but not without qualms, the detective ultimately finds that his mission has led him through the labyrinth on a path that describes an irregular circle.

There is also an author, who appears in each of the novels, who may or may not be called “Paul Auster” and may or may not share personality traits or biographical elements with the person whose name appears on the spine. He is, in the finest tradition, merely a witness, moved to transmit the story while maintaining a measured reserve. Or is he perhaps the central character, setting up a lookalike as a blind to cover the degree of his involvement? Auster encourages this line of speculation, which is a labyrinth of another sort and bears a pedigree which—as he reminds us, riffing under his own name on the conundrum of Don Quixote—far predates postmodernism. If the city is a forest and the detective is a pilgrim, the author is a pilgrim as well. He is the one who makes it out alive, who can exchange his story for supper and a bed of straw.

There have been, in two hundred years, a great many novels and stories set in New York City, but until Paul Auster’s trilogy no one had made a serious effort to demonstrate its extreme antiquity, its surface flimsiness compared to its massive subterranean depths, its claim on the origins of stories far older than written culture. But now we know, and that truth will inhere no matter how many times the city is reconfigured and how thoroughly living memory is banished from it. Auster, who owns the key, makes its use available to all readers.