there—a dull gray ovoid, with a lifting eye set in the top. It didn't look dangerous. It just lay quietly, waiting....

Back at the telephone, I had trouble finding my voice. "How long?" I croaked.

"It was triggered when you entered the vault," Kayle said. "There's a time mechanism. It's irreversible; you can't force anyone to cancel it. And it's no use your hiding in the outer passages.

"The whole center will be destroyed in the blast. Even it can't stand against a bomb buried in its heart. But we'll gladly sacrifice the center to eliminate you."

"How long!"

"I suggest you come out quickly, so that a crew can enter the vault to disarm the bomb."

"How long!"

"When you're ready to emerge, call me." The line went dead.

I put the phone back in its cradle carefully, like a rare and valuable egg.

I tried to think. I'd been charging full speed ahead ever since I had decided on my scheme of action while I was still riding the surf off the Florida coast, and I'd stuck to it. Now it had hatched in my face—and the thing that had crawled out wasn't the downy little chick of success. It had teeth and claws and was eyeing me like a basilisk....

But I still had unplayed aces—if there was time.

I had meant to use the matter transmitter to stage a dramatic proof that I wasn't the tool of the enemy. The demonstration would be more dramatic than I'd planned. The bomb would fit the machine as easily as the tape. The wheels would be surprised when their firecracker went off—right on schedule—in the middle of the Mojave Desert.

I set to work, my heart pounding. If I could bring this off—if I had time—if the transmitter worked as advertised....

The stolen knowledge flowed smoothly, effortlessly. It was as though I had been assembling matter transmitters for years, knew every step by heart. First the moebius windings; yard after yard of heavy copper around a core of carbon; then the power supply, the first and second stage amplimitters....

How long? In 

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