“Cartography. A watershed is an area of land, usually mountains or forests, that drains into a river. History is also a river. Wouldn’t you say so?”

“Yes. I suppose I would.” I drank some of my tea.

“Sometimes the events that change history are widespread—like heavy, prolonged rains over an entire watershed that can send a river out of its banks. But rivers can flood even on sunny days.

All it takes is a heavy, prolonged downpour in one small area of the watershed. There are flash floods in history, too. Want some examples? How about 9/11? Or what about Bush beating Gore in 2000?”

“You can’t compare a national election to a flash flood, Al.”

“Maybe not most of them, but the 2000 presidential election was in a class by itself. Suppose you could go back to Florida in the fall of Double-O and spend two hundred thousand dollars or so on Al Gore’s behalf?”

“Couple of problems with that,” I said. “First, I don’t have two hundred thousand dollars.

Second, I’m a schoolteacher. I can tell you all about Thomas Wolfe’s mother fixation, but when it comes to politics I’m a babe in the woods.”

He gave an impatient flap of his hand, which almost sent his Marine Corps ring flying off his reduced finger. “Money’s not a problem. You’ll just have to trust me on that for now. And advance knowledge usually trumps the shit out of experience. The difference in Florida was supposedly less than six hundred votes. Do you think you could buy six hundred votes on Election Day with two hundred grand, if buying was what it came down to?”

“Maybe,” I said. “Probably. I guess I’d isolate some communities where there’s a lot of apathy and the voting turnout’s traditionally light—it wouldn’t take all that much research—then go in with the old cashola.”

Al grinned, revealing his missing teeth and unhealthy gums. “Why not? It worked in Chicago for years.”

The idea of buying the presidency for less than the cost of two Mercedes-Benz sedans silenced me.

“But when it comes to the river of history, the watershed moments most susceptible to change are assassinations—the ones that succeeded and the ones that failed. Archduke Franz Ferdinand of Austria gets shot by a mentally unstable pipsqueak named Gavrilo Princip and there’s your kickoff to World War I. On the other hand, after Claus von Stauffenberg failed to kill Hitler in 1944—close, but no cigar—the war continued and millions more died.” I had seen that movie, too.

Al said, “There’s nothing we can do about Archduke Ferdinand or Adolf Hitler. They’re out of our reach.”

I thought of accusing him of making pronounal assumptions and kept my mouth shut. I felt a little like a man reading a very grim book. A Thomas Hardy novel, say. You know how it’s going to end, but instead of spoiling things, that somehow increases your fascination. It’s like watching a kid run his electric train faster and faster and waiting for it to derail on one of the curves.

“As for 9/11, if you wanted to fix that one, you’d have to wait around for forty-three years.

You’d be pushing eighty, if you made it at all.”

Now the lone-star flag the gnome had been holding made sense. It was a souvenir of Al’s last jaunt into the past. “You couldn’t even make it to ’63, could you?” To this he didn’t reply, just watched me. His eyes, which had looked rheumy and vague when he let me into the diner that afternoon, now looked bright. Almost young.

“Because that’s what you’re talking about, right? Dallas in 1963?”

“That’s right,” he said. “I had to opt out. But you’re not sick, buddy. You’re healthy and in the prime of life. You can go back, and you can stop it.”

He leaned forward, his eyes not just bright; they were blazing.

“You can change history, Jake. Do you understand that? John Kennedy can live. ” 4

I know the basics of suspense fiction—I ought to, I’ve read enough thrillers in my lifetime—

and the prime rule is to keep the reader guessing. But if you’ve gotten any feel for my character at all, based on that day’s extraordinary events, you’ll know that I wanted to be convinced. Christy Epping had become Christy Thompson (boy meets girl on the AA campus, remember?), and I was a man on his own. We didn’t even have any kids to fight over. I had a job I was good at, but if I told you it was challenging, it would be a lie. Hitchhiking around Canada with a buddy after my senior year of college was the closest thing to an adventure I’d ever had, and given the cheerful, helpful nature of most Canadians, it wasn’t much of an adventure. Now, all of a sudden, I’d been offered a chance to become a major player not just in American history but in the history of the world. So yes, yes, yes, I wanted to be convinced.

But I was also afraid.

“What if it went wrong?” I drank down the rest of my iced tea in four long swallows, the ice cubes clicking against my teeth. “What if I managed, God knows how, to stop it from happening and made things worse instead of better? What if I came back and discovered America had become a fascist regime? Or that the pollution had gotten so bad everybody was walking around in gas masks?”

“Then you’d go back again,” he said. “Back to two minutes of twelve on September ninth of 1958. Cancel the whole thing out. Every trip is the first trip, remember?”

“Sounds good, but what if the changes were so radical your little diner wasn’t even there anymore?”

He grinned. “Then you’d have to live your life in the past. But would that be so bad? As an English teacher, you’d still have a marketable skill, and you wouldn’t even need it. I was there for four years, Jake, and I made a small fortune. Do you know how?” I could have taken an educated guess, but I shook my head.

“Betting. I was careful—I didn’t want to raise any suspicions, and I sure didn’t want some bookie’s leg-breakers coming after me—but when you’ve studied up on who won every big sporting event between the summer of 1958 and the fall of 1963, you can afford to be careful. I won’t say you can live like a king, because that’s living dangerously. But there’s no reason you can’t live well.

And I think the diner’ll still be there. It has been for me, and I changed plenty of things. Anybody does. Just walking around the block to buy a loaf of bread and a quart of milk changes the future.

Ever hear of the butterfly effect? It’s a fancy-shmancy scientific theory that basically boils down to the idea that—”

He started coughing again, the first protracted fit since he’d let me in. He grabbed one of the maxis from the box, plastered it across his mouth like a gag, and then doubled over. Gruesome retching sounds came up from his chest. It sounded as if half his works had come loose and were slamming around in there like bumper cars at an amusement park. Finally it abated. He glanced at the pad, winced, folded it up, and threw it away.