She played it. They listened. They heard the frantic rush of Paige's voice telling Bethany to go to her residence, to get the entity and get out of Border Town. To use it. To go public with whatever she learned. To get Travis Chase's help if necessary. Then she said, " Shit, what else…? " and went silent for a few seconds. Travis caught the sound he remembered from the first time he'd heard the recording: running footsteps, men coming to get her. That sound was all he'd heard on the first listen, at that part of the clip. This time he focused on the other sound, right there beside it in the audio. The more important sound, by far. Paige's breathing in the absence of her voice. Two breaths, deep and fast. They didn't shudder on the way out. They seethed. Travis got the sense that however scared Paige was, she was frustrated even more. She was struggling to remember something critical, some detail she needed to tell Bethany in the few seconds she had left. Which was strange, in retrospect: if all Paige needed to say was that a person could step through the projected opening, would that have been hard to remember? Would it have even been necessary? Wouldn't Paige expect them to figure that out for themselves?
A second later they heard Bethany's voice on the recording: " What's happening? Where are you? "
Paige's voice came back in, louder and more intense than before. " You can take it through and still come back! You can take it through! "
Then it was over.
In the silence Travis looked at Bethany.
They both looked at the black cylinder, still lying in the armchair, still switched on. The iris stood open to the forest and the overcast sky above it. The manila rope lay in tangles on the carpet where they'd left it after pulling it up.
"Take it through," Bethany said, turning the phrase over like a found artifact. "Does she mean the cylinder? Take the cylinder through the iris?"
Travis stared at the thing. It was hard to imagine what else Paige could have meant.
"It would be easy to do," he said. "Switch it off with the delay, and then carry the cylinder through the iris during the minute and a half it stays open."
"You'd have to be out of your mind," Bethany said. "What happens when the iris shuts behind you? Now you're stuck seventy years in the future, with a machine that can only take you seventy years further into the future. You'd never get home."
"What if it doesn't work like that? What if turning it on in the future just opens the iris back to the present time? Like a toggle. Back and forth."
"How would it know to do that?" Bethany said. "How would it know it was in the future?"
"I don't know. Maybe it's something simple. Maybe it senses when it's taken through the iris, and switches itself into reverse. We'll never know how it works, but think of what we just heard. Paige said you can take it through and come back. She knew a lot more about this thing than we do."
He watched Bethany mull it over. Watched her warm to it.
"The logic adds up," she said. "Someone built this thing for a purpose. I can't see the use of something that just leapfrogs you further and further ahead in time, and never lets you come back. Forward and back makes more sense."
"It also explains why the cylinders came as a pair," Travis said. "Think about it. Who knows what this kind of machine was meant for, but we can imagine any number of things. It could be some military scouting tool. Use it to survey the aftermath of a war you haven't even fought yet. Hell, it could be farm equipment. Say there's some high-value crop that takes seven decades to mature. Sow the seeds, step through the iris and reap the rewards right away. But whatever the use, its makers had a reason to allow the delayed shutoff. That way you can take the cylinder with you when you go through the iris. Not hard to imagine why they'd want to. Leaving it behind, switched on, is a major vulnerability. Look at the precautions we had to take, setting it up so nothing could get at it from the other side. But here's the thing: taking it with you would be risky too. Extremely risky, in fact. Picture yourself putting this thing to casual use. Like it's a socket wrench or a screwdriver. You're using it all day long, going back and forth between two points in time, hauling food supplies or weapons or whatever. Can you think of the mistake you might make? It would be the easiest thing to do, and if you did it you'd be in a world of trouble."
Bethany's eyes narrowed. She thought about it. "You could accidentally leave the cylinder behind. Leave it on the other side of the iris when it closed."
Travis nodded. "It would happen one of two ways. Either you leave it in the future, in which case there's no way to retrieve it except to sit on your ass and wait several decades, or else you leave it in the past and trap yourself in the future, in which case you're absolutely screwed."
Bethany walked over to the armchair. Stared down at the cylinder.
"You'd want a backup copy," she said.
"You'd need a backup copy. Like a skydiver needs a reserve chute. Because some mistakes you can't afford to make even once. You'd have a duplicate cylinder, and you'd strap it to your back and never take it off, at least not while you were using the first one."
Bethany met his eyes. "It makes sense that Paige and the others would've figured this out. In the desert they had both cylinders. They could have tested this idea without any risk of getting stranded. Just leave one of them switched on, and use the other one to find out whether or not the iris brings you back to the present time."
Travis nodded. It all added up.
A silence drew out.
"We could be wrong about this," Bethany said.
"We could be very wrong."
"Just plain old wrong would be bad enough. If we try this and it doesn't work, we're stuck over there."
"If we try it and it does work," Travis said, "then we can take the cylinder into the future, carry it up to the ninth floor of that ruin on M Street, and step back into the present time right inside the room where they're holding Paige."
The idea seemed to wash over Bethany like a breeze on a spring day.
"Nice," she said.