Mr. Vollmann is 54, heterosexual and married with a daughter in high school. He began cross-dressing seriously about five years ago. Sometimes he transforms himself into a woman as part of a strange vision quest, aided by drugs or alcohol, to mind-meld with a female character in a book he’s writing. Other times it’s just because he likes the “smooth and slippery” feel of women’s lingerie.

He said his wife, who is an oncologist, is not thrilled with his outré experiments and keeps her distance. “Probably when the book comes out, it’ll be the first she’s heard of it,” he said. “I always try to keep my wife and child out of what I do. I don’t want to cause them any embarrassment.” He asked that his wife not be interviewed for this article.

I was sitting on the train one day chipping away at William T. Vollmann’s latest slab of obsessional nonfiction when my friend Tsia, who incidentally is not an underage Thai street whore, offered to save me time with a blurby one-sentence review based entirely on the book’s cover and my synopsis of its first 50 pages. “Just write that it’s like Robert Caro’s The Power Broker,” she said, “but with the attitude of Mike Davis’s City of Quartz.” This struck me as good advice, and I was all set to take it, but as I worked my way through the book’s final 1,250 pages, I found I had to modify it, slightly, to read as follows: Imperial is like Robert Caro’s The Power Broker with the attitude of Mike Davis’s City of Quartz, if Robert Caro had been raised in an abandoned grain silo by a band of feral raccoons, and if Mike Davis were the communications director of a heavily armed libertarian survivalist cult, and if the two of them had somehow managed to stitch John McPhee’s cortex onto the brain of a Gila monster, which they then sent to the Mexican border to conduct ten years of immersive research, and also if they wrote the entire manuscript on dried banana leaves with a toucan beak dipped in hobo blood, and then the book was line-edited during a 36-hour peyote seance by the ghosts of John Steinbeck, Jack London, and Sinclair Lewis, with 200 pages of endnotes faxed over by Henry David Thoreau’s great-great-great-great grandson from a concrete bunker under a toxic pond behind a maquiladora, and if at the last minute Herman Melville threw up all over the manuscript, rendering it illegible, so it had to be re-created from memory by a community-theater actor doing his best impression of Jack Kerouac. With photographs by Dorothea Lange. (Viking has my full blessing to use that as a blurb.)