He turned away from me, though, and lunged at Great-great. I dove at him in a street clothes version of the flying tackle and we went down together. Angus Haney was stronger than I had expected. Or maybe it wasn't that. Maybe he was fighting with desperation. Because the machine meant everything to him.

Well, the ten grand wasn't exactly chicken feed to me, either. If Angus was going to fight back, I had to play rough. I clubbed him across the mouth with my right fist and his lips became a bloody smear, but he kept kicking and twisting and writhing to get at his relative, who stood poised now over the time machine with the length of steel pipe.

"Don't!" Angus Haney screamed, and rolled clear of me. He was on his feet in an instant and wrestling to get the pipe from my companion.

"If I destroy it, you fool," the man who hadn't been born yet said, "I won't build my own version of it and won't be trapped back here in your twentieth century. You can't stop me."

But Angus, who outweighed his antagonist, had other ideas. In the brief time it took me to climb to my feet and reach them, the metal pipe went clattering away across the floor and Angus was wrestling his relative away from the time machine. I grabbed Angus' shoulder and swung him around and hit him. He dropped like a stone and, with a whoop of triumph, my companion scrambled after the heavy metal pipe.

Angus was down but not out. I'll have to say this for him; he had guts. He was on his feet again before Great-great could reach the machine.

I'll never forget that scene. For a moment time seemed to be suspended. Great-great stood poised with the metal pipe at the top of its arc, ready to bring it down with crushing force on the delicate control bank of the machine. Angus seemed to stop in mid-air as he leaped for the pipe. Immediately behind him was the glass-enclosed booth of the machine. Or—and this is important—it was glass-enclosed on three sides. The fourth side was nothing but air.

I caught Angus around the waist and pulled him back. We stumbled away from the machine and then back toward it. Suddenly Angus went limp. It was the oldest trick in the book, but I fell for it. I relaxed my hold on him and, as soon as I did, he became a fury. Something struck the side of my head and the next thing I knew I was staggering toward the time machine.

Just as Great-great brought the heavy metal pipe down.

I staggered inside the glass-enclosed booth.