At the airportnewsstand, Keller picked up a paperback western. The cover was pretty much generic, showing a standard-issue Marlboro man, long and lean, walking down the dusty streets of a western town with a gun riding his hip. Neither the title nor the author’s name meant anything to Keller. What drew him was a line that seemed to leap out from the cover.

“He rode a thousand miles,” Keller read, “to kill a man he never met.”

Keller paid for the book and tucked it into his carry-on bag. When the plane was in the air he dug it out and looked at the cover, wondering why he’d bought it. He didn’t read much, and when he did he never chose westerns.

Maybe he wasn’t supposed to read this book. Maybe he was supposed to keep it as a talisman.

All for that one sentence. Imagine riding a thousand miles on a horse for any purpose, let alone the killing of a stranger. How long would it take, a thousand-mile journey on horseback? A thoroughbred got around a racecourse in something like two minutes, but it couldn’t go all day at that pace any more than a human being could string together twenty-six four-minute miles and call it a marathon.

What could you manage on a horse, fifty miles a day? A hundred miles in two days, a thousand miles in twenty? Three weeks, say, at the conclusion of which a man would probably be eager to kill anybody, stranger or blood kin.

Was Ol’ Sweat ’n’ Leather getting paid for his thousand miles? Was he in the trade? Keller turned the book over in his hands, read the paragraph on the back cover. It did not sound promising. Something about a drifter in the Arizona territory, a saddle tramp, looking to avenge an old Civil War grievance.