"You really want to decommission Teddy?" he asked.

"His name isn't Teddy."

"Private Bear," Ben tried.

"Just Bear, and I never want to see him again!" Sam yanked the covers over his head. "Now go away! Everybody. Just. Go. Away!"

I took a step toward him. Ben tsked at me and jerked his head toward the door. I followed him out of the room. A large shadow hulked by the window down the hall: the big, silent kid named Poundcake, whose silence did not fall into the creepy category, more like the profound stillness of a mountain lake variety. Ben leaned against the wall, hugging Bear to his chest, mouth slightly open, sweating despite the freezing temperature. Exhausted after a tussle with a couple of kids, Ben was in trouble, which meant we all were.

"He didn't know your dad was dead," he said.

I shook my head. "He did and he didn't. One of those things."

"Yeah." Ben sighed. "Those things."

A lead ball of silence the size of Newark dropped between us. Ben was absently stroking Bear's head like an old man strokes a cat while reading the newspaper.

"I should go back to him," I said.

Ben sidestepped to the door, blocking my way. "Maybe you shouldn't."

"Maybe you shouldn't poke your nose into-"

"Not the first person in his life to die. He'll deal."

"Wow. That was harsh." We're talking about the guy who was my father, too, Zombie boy.

"You know what I meant."

"Why do people always say that after they say something totally cruel?" Then I said it, because I may have certain issues with self-editing: "I happen to know what it's like to 'deal' with death all by yourself. Just you and nothing else but the big empty of where everything used to be. It would have been nice, really, really nice, to have had someone there with me . . ."

"Hey," Ben said softly. "Hey, Cassie, I didn't-"

"No, you didn't. You really didn't." Zombie. Because he didn't have feelings, dead inside like a zombie? There were people at Ashpit like that. Shufflers, I called them, human-shaped sackfuls of dust. Something irreplaceable had crumbled inside. Too much loss. Too much pain. Shuffling, blank-eyed, slack-jawed mutterers. Was that Ben? Was he a shuffler? Then why did he risk everything to rescue Sam?

"Wherever you were," Ben said slowly, "we were there, too."

The words stung. Because they were true and because someone else said practically the same thing to me: You're not the only one who's lost everything. That someone else suffered the ultimate loss. All for my sake, the cretin who must be reminded, again, that she's not the only one. Life is full of little ironies, but it's also pockmarked with some the size of that big rock in Australia.

Time to change the subject. "Did Ringer leave?"

Ben nodded. Stroke, stroke. The bear was bugging me. I tugged it from his arms.

"I tried to send Poundcake with her," he said. He laughed softly. "Ringer." I wondered if he was aware of how he said her name. Quietly, like a prayer.

"You know we have no backup plan if she doesn't come back."

"She'll come back," he said firmly.

"What makes you so sure?"

"Because we have no backup plan." Now an all-out, full smile, and it's disorienting, seeing the old smile that lit up classrooms and hallways and yellow school buses overlaid on his new face, reshaped by disease and bullets and hunger. Like turning a corner in a strange city and running into someone you know.

"That's a circular argument," I pointed out.

"You know, some guys might feel threatened being surrounded by people smarter than they are. But it just makes me more confident."

He squeezed my arm and limped across the hall to his room. Then it's the bear and the big kid down the hall and the closed door and me in front of the closed door. I took a deep breath and stepped inside the room. Sat beside the lump of covers. I didn't see him but knew he was there. He didn't see me but knew I was there.

"How did he die?" Muffled voice buried.

"He was shot."

"Did you see?"

"Yes."

Our father crawling, hands clawing the dirt.

"Who shot him?"

"Vosch." I closed my eyes. Bad idea. The dark snapped the scene into sharp focus.

"Where were you when he shot him?"

"Hiding."

I reached to pull down the covers. Then I couldn't. Wherever you were. In the woods somewhere off an empty highway, a girl zipped herself up in a sleeping bag and watched her father die again and again. Hiding then, hiding now, watching him die again and again.

"Did he fight?"

"Yes, Sam. He fought very hard. He saved my life."

"But you hid."

"Yes." Crushing Bear against my stomach.

"Like a big fat chicken."

"Not like that," I whispered. "It wasn't like that."

He slung the blankets aside and bolted upright. I didn't recognize him. I'd never seen this kid before. Face ugly and twisted by rage and hate.

"I'm going to kill him. I'm going to shoot him in the head!"

I smiled. Or tried to, anyway. "Sorry, Sams. I have dibs."

We looked at each other and time folded in on itself, the time we had lost in blood and the time we had purchased in blood, the time when I was just the bossy big sister and he was the annoying little brother, the time when I was the thing worth living for and he was the thing worth dying for, and then he crumpled into my arms, the bear smushed between us the way we were trapped between the before-time and the after-time.

I lay down next to him and together we said his prayer: If I should die before I wake . . . And then I told him the story of how Dad died. How he stole a gun from one of the bad guys and single-handedly took out twelve Silencers. How he stood up to Vosch, telling him, You can crush our bodies but never our spirit. How he sacrificed himself so I could escape to rescue Sam from the evil galactic horde. So one day Sam could gather the ragtag remnants of humanity and save the world. So his memories of his father's last moments aren't of a broken, bleeding man crawling in the dirt.

After he fell asleep, I slipped out of bed and returned to my post by the window. A strip of parking lot, a decrepit diner ("All You Can Eat Wednesdays!"), and a stretch of gray highway fading into black. The Earth dark and quiet, the way it was before we showed up to fill it with noise and light. Something ends. Something new begins. This was the in-between time. The pause.

On the highway, beside an SUV that had run into the median strip, starlight glinted off the unmistakable shape of a rifle barrel, and for a second my heart stopped. The shadow toting the gun darted into the trees and I saw the shimmer of jet-black hair, glossy and perfectly, annoyingly straight, and I knew the shadow was Ringer.

Ringer and I didn't start off on the right foot, and the relationship just went downhill from there. She treated everything I said with a kind of icy contempt, like I was lying or stupid or just crazy. Especially when Evan Walker came up. Are you sure? That doesn't make any sense. How could he be both human and alien? The hotter I got, the colder she got, until we canceled each other out like either side of a chemical equation. Like E=MC2, the kind of chemical equation that makes massive explosions possible.

Our parting words were a perfect example.

"You know, Dumbo I get," I told her. "The big ears. And Nugget, because Sam is so small. Teacup, too. Zombie I don't get so much-Ben won't say-and I'm guessing Poundcake has something to do with his roly-poly-ness. But why Ringer?"

Her answer was an icy stare.

"It makes me feel a little left out. You know, the only gang member without a street name."

"Nom de guerre," she said.

I looked at her for a minute. "Let me guess, National Merit Scholar, chess club, math team, top of your class? And you play an instrument, maybe a violin or cello, something with strings. Your dad worked in Silicon Valley and your mom was a college professor, I'm thinking physics or chemistry."

She didn't say anything for a couple thousand years. Then she said, "Anything else?"

I knew I should stop. But I was in now, and when I go in, I go all the way in. That's the Sullivan way. "You're the oldest-no, an only child. Your dad is a Buddhist, but your mom is an atheist. You were walking at ten months. Your grandmother raised you because your parents worked all the time. She taught you tai chi. You never played with dolls. You speak three languages. One of them is French. You were on the Olympic development team. Gymnastics. You brought home a B once and your parents took away your chemistry set and locked you in your room for a week, during which time you read the complete works of William Shakespeare." She was shaking her head. "Okay, not the comedies. You just couldn't get the humor."

"Perfect," she said. "That's amazing." Her voice was as flat and thin as a piece of aluminum foil fresh from the roller. "Can I try you?"

I stiffened up a little, bracing myself. "You can try."

"You've always been self-conscious about your looks, especially your hair. The freckles are a close second. You're socially awkward, so you read a lot and you've kept a journal since middle school. You had only one close friend and your relationship was codependent, which means every time you fought with her, you slid into a deep depression. You're a daddy's girl, never that close to your mother, who always made you feel like no matter what you did, it wasn't good enough. It didn't help that she was prettier than you. When she died, you felt guilty for secretly hating her and for being secretly relieved that she was gone. You're stubborn and impulsive and a little hyper, so your parents enrolled you in something to help with your coordination and concentration, like ballet or karate, probably karate. You want me to go on?"

Well, what was I going to do? I saw only two options: laugh or punch her in the face. Okay, three: laugh, punch her in the face, or give back one of her own stoic stares. I opted for number three.

Bad idea.

"Okay," Ringer said. "You're not a tomboy and you're not a girly girl. You're in that gray area in between. Being an in-between meant you always secretly envied the ones who weren't, but you saved most of your resentment for the pretty girls. You've had crushes but never a boyfriend. You pretend you hate boys you like and like boys you hate. Whenever you're around someone who's prettier or smarter or better than you in any way, you get angry and sarcastic, because they remind you of how ordinary you feel inside. Go on?"

And tiny-voiced me: "Sure. Whatever."

"Until Evan Walker came along, you had never even held a boy's hand, except on elementary school field trips. Evan was kind and undemanding and, as an added bonus, almost too beautiful to look at. He made himself an empty canvas you could paint with your longing for a perfect relationship with the perfect guy who would ease your fear by never hurting you. He gave you all those things you imagined the pretty girls had that you never did, so being with him-or the idea of him-was mostly about revenge."

I was biting my lower lip. My eyes burned. I clenched my fists so hard, my nails were biting into my palms. Why, oh, why didn't I go with option two?

She said, "You want me to stop now." Not a question.

I lifted my chin. And Defiance shall be my nom de guerre! "What's my favorite color?"

"Green."

"Wrong. It's yellow," I lied.

She shrugged. She knew I was lying. Ringer: the human Wonderland.

"Seriously, though, why 'Ringer'?" That's it. Put her back on the defensive. Well, she never actually was on the defensive. That would be me.

"I'm human," she said.

"Yeah." I peeked through the crack in the curtains to the parking lot two stories below. Why did I do that? Did I really think I'd see him standing there, lurker that he was, smiling up at me? See? I said I'd find you. "Someone else told me that, too. And, like a dummy, I believed him."

"Not so dumb, given the circumstances."

Oh, now she was being kind? Now she was cutting me some slack? I didn't know which was worse: ice maiden Ringer or compassionate queen Ringer.

"Don't pretend," I snapped. "I know you don't believe me about Evan."

"I believe you. It's his story that doesn't make sense."

Then she walked out of the room. Just like that. Right in the middle, before anything was resolved. Who, besides every male person ever born, does that?

A virtual existence doesn't require a physical planet . . .

Who was Evan Walker? Shifting my eyes from the highway to my baby brother and back again. Who were you, Evan Walker?

I was an idiot for trusting him, but I was hurt and alone (alone as in thinking I was the last human being in the freaking universe) and majorly mind screwed because I had already killed one innocent person, and this person, this Evan Walker, didn't end my life when he could have; he saved it. So when the bells went off, I ignored them. Plus it didn't hurt (help?) that he was impossibly gorgeous and equally impossibly obsessed with making me feel like I mattered more to him than he did to himself, from bathing me to feeding me to teaching me how to kill to telling me I was the one thing he had left worth dying for to proving it all by dying for me.

He began as Evan, woke up thirteen years later to find out he wasn't, then woke again, he told me, when he saw himself through my eyes. He found himself in me, and then I found him in me and I was in him and there was no space between us. He began by telling me everything I wanted to hear and ended telling me the things I needed to: The principal weapon to eradicate the human hangers-on were the humans themselves. And when the last of the "infested" were dead, Vosch and company would pull the plug on the 5th Wave. Purge over. House clean and ready to move in.

When I told Ben and Ringer all this-minus the part about Evan being inside me, a bit too nuanced for Parish-there was a lot of dubious staring and significant looks from which I was painfully excluded.

"One of them was in love with you?" Ringer asked when I finished. "Wouldn't that be like us falling in love with a cockroach?"

"Or a mayfly," I shot back. "Maybe they have a thing for insects."

We were meeting in Ben's room. Our first night at the Walker Hotel, as Ringer dubbed it, mostly, I think, to get under my skin.

"What else did he tell you?" Ben asked. He was sprawled on the bed. Four miles from Camp Haven to the hotel, and he looked like he'd just sprinted a marathon. The kid who patched me and Sam up, Dumbo, wouldn't commit when I asked him about Ben. Wouldn't say if he'd get better. Wouldn't say if he'd get worse. Of course, Dumbo was only twelve. "Capabilities? Weaknesses?"

"They have no bodies anymore," I said. "Evan told me that it was the only way they could make the journey. Some were downloaded-him, Vosch, the other Silencers-some are still on the mothership, waiting for us to be gone."

Ben rubbed his mouth with the back of his hand. "The camps were set up to winnow out the best candidates for brainwashing . . ."

"And to dispose of the ones who weren't," I finished. "Once the 5th Wave was rolled out, all they had to do was sit back and let the stupid humans do their dirty work."

Ringer was sitting by the window, silent as a shadow.

"But why use us at all?" Ben wondered. "Why not download enough of their troops into human bodies to finish us off?"

"Not enough of them, maybe," I guessed. "Or setting up the 5th Wave posed the least risk."

"What risk?" Shadow-Ringer said, breaking her silence.