It was 540 AM—a radio station.

Shaking Chubs back awake wasn’t enough for me, not when I thought I would actually burst at the seams with excitement. I all but pounced onto Chubs’s back, both scaring him senseless and kneeing him in the kidney in the process. I’m not sure what sound he made when I landed, but I was fairly certain it wasn’t human.

“Wake up, wake up, wake up!” I hissed, hauling him huffing and puffing and cursing to his feet. “When they gave you EDO, did they say anything else?”

“Green, if I can still walk tomorrow, so help me God—”

“Listen to me!” I hissed. “Did they say anything about tuning in, or picking it up?”

He fixed me with a baleful look. “All they said was to check out Edo.”

“Check out?” I repeated. “Those exact words?”

“Yes!” he said, exasperated. “Why?”

“I was wrong before,” I said. “I don’t think the number has anything to do with a phone number. We were right before. The last letter isn’t a letter at all—it was supposed to be a zero. Five forty. It’s some kind of radio station.”

“How in the world did you reach that conclusion?”

Ah. The tricky part in all of this. How to B.S. the fact I had cheated and seen the answer, rather than being in possession of brain power to actually work it through. “I was trying to think of what else uses three digit numbers, when I remembered hearing them—Greg and the others, I mean—talk about needing to find a radio here. I should have mentioned it to you guys before, but I didn’t think anything of it until now.”

“Oh my God.” Chubs was shaking his head, mildly stunned. “I don’t even believe it. We have honestly had such shit luck this entire trip I thought at least two of us were going to end up dead in a ditch somewhere before we figured it out.”

“We need a radio,” I said. “I think I’m right, but if I’m not…we need to test it before telling the others.”

“Betty?”

“No!” I wasn’t about to leave the tent unguarded, even for fifteen minutes. “I thought I saw a radio in the back—let me go grab it.”

The store was rushing around me in dark streams and fading colors as I ran, but I wasn’t afraid of what was lurking there, not now. I hadn’t imagined the radio after all. It was back in the small cluster of rafts and blankets that Liam and his friend had set up the last time he was here.

Chubs was pacing in front of the shelves by the time I got back. I set the small device up on a shelf that was about eye level and began to fuss with its buttons, searching for the ON switch.

I had to be the one to start it up—and the one to fumble with the volume knob when it just about blew our eardrums out with static. The thing was ancient, a beat-up silver box, but it worked. The speakers jumped between voices, commercials, and even a few old songs I recognized.

“It has to be AM,” Chubs said, taking the radio in his hands. “FM frequencies don’t go up past 108 or so. Here we go—”

My first thought was that Chubs had somehow tuned it to the wrong station. I had never heard a sound like the one sputtering through the speakers—a low growl of static pierced by what sounded like a tub of broken glass being tossed around. It wasn’t painful like the White Noise, but it wasn’t pleasant, either.

But Chubs was still grinning.

“Do you know what this is?” he asked, and was all too happy to explain when I shook my head. “Have you heard that there are certain frequencies and pitches that only kids with a Psi brain can pick up?”

I braced a hand on the shelf to keep from doubling over. I had. Cate had told me as much, when she explained the camp controllers had embedded a certain frequency in the White Noise to root out any of the dangerous ones still hiding out in the other cabins.

“It’s not so much that others can’t hear the noise, it’s that their brains translate the sounds differently than ours do—really fascinating stuff. They did some testing with it at Caledonia, to see if there were any pitches that certain colors couldn’t pick up and others could, and it always sounded like this when we couldn’t—”

No sooner had the words left his mouth, than there was another sharp click, and the noise cut off altogether, replaced by a soft, male voice whispering, “If you can hear this, you’re one of us. If you’re one of us, you can find us. Lake Prince. Virginia.”

That same message, three times, before it clicked again and switched back to the frequency we had heard before. For a long time, Chubs and I could only stare at one another, speechless.

“Oh my God!” Chubs said, “Oh my God!” And then we were saying it together, jumping up and down, arms flung around one another like two damn fools—like we had never, ever wanted to reach over and slap each other multiple times on multiple days. I hugged him without any kind of fear or self-consciousness, fiercely, with a rush of emotion that almost brought tears to my eyes.

“I could kiss you!” Chubs cried.

“Please don’t!” I gasped out, feeling his arms tighten around my ribs to the point of cracking them.

Either by his internal clock or Chubs’s excited squeaks, Liam woke first. I saw him out the corner of my eye, his head of tousled blond hair sticking out of the tent. He looked between us once and retreated back into the tent, only to reemerge a second later looking torn between confusion and worry.