There is the river reeking of human waste and human remains, black and swift and silent beneath the clouds that hide the glowing green eye of the mothership.

And there's the seventeen-year-old high school football jock dressed up like a soldier with a high-powered semiautomatic rifle that the ones from the glowing green eye gave him, crouching by the statue of a real soldier who fought and died with clear mind and clean heart, uncorrupted by the lies of an enemy who knows how he thinks, who twists everything good in him to evil, who uses his hope and trust to turn him into a weapon against his own kind. The kid who didn't go back when he should have and now goes back when he shouldn't. The kid called Zombie, who made a promise, and if he breaks that promise, the war is over-not the big war, but the war that matters, the one in the battlefield of his heart.

Because promises matter. They matter now more than ever.

In the park by the river in the snow spinning down.

I feel the chopper before I hear it. A change in pressure, a thrumming against my exposed skin. Then the rhythmic percussion of the blades, and I rise unsteadily, pressing my hand into the bullet wound in my side.

"Where should I shoot you?" Ringer asked.

"I don't know, but it can't be the legs or the arms."

And Dumbo, who had plenty of experience with human anatomy from processing duty: "Shoot him in the side. Close range. And angled this way, or you'll puncture his intestines."

And Ringer: "What do we do if I puncture your intestines?"

"Bury me, because I'll be dead."

A smile? No. Damn.

And afterward, as Dumbo examined the wound, she asked, "How long do we wait for you?"

"No more than a day."

"A day?"

"Okay. Two days. If we aren't back in forty-eight hours, we aren't coming back."

She didn't argue with me. But she said, "If you aren't back in forty-eight hours, I'm coming back for you."

"Dumb move, chess player."

"This isn't chess."

Black shadow roaring over the bare branches of the trees ringing the park, and the heavy pulsing beat of the rotors like an enormous racing heart, and the icy wind blasting down, pressing on my shoulders as I hoof it toward the open hatch.

The pilot whips his head around as I dive inside. "Where's your unit?"

Falling into the empty seat. "Go! Go!"

And the pilot: "Soldier, where's your unit?"

From the trees my unit answers, opening up a barrage of continuous fire, and the rounds slam and pop into the reinforced hull of the Black Hawk, and I'm shouting at the top of my lungs, "Go, go, go!" Which costs me: With every "Go!" blood is forced through the wound and dribbles through my fingers.

The pilot lifts off, shoots forward, then banks hard to the left. I close my eyes. Go, Ringer. Go.

The Black Hawk lays down strafing fire, pulverizing the trees, and the pilot is shouting something at the copilot, and the chopper is over the trees now, but Ringer and my crew should be long gone, down on the walking trail that borders the dark banks of the river. We circle the trees several times, firing until the trees are shattered stubs of their former selves. The pilot glances into the hold, sees me lying across two seats, holding my bloody side. He pulls up and hits the gas. The chopper shoots toward the clouds; the park is swallowed up by the white nothing of the snow.

I'm losing consciousness. Too much blood. Too much. There's Ringer's face, and damn if she isn't just smiling, she's laughing, and good for me, good for me that I made her laugh.

And there's Nugget, and he definitely isn't smiling.

Don't promise, don't promise, don't promise! Don't promise anything ever, ever, ever!

"I'm coming. I promise."

64.

I WAKE UP where it began, in a hospital bed, bandaged up and floating on a sea of painkillers, circle complete.

It takes me several minutes to realize I'm not alone. There's someone sitting in the chair on the other side of the IV drip. I turn my head and see his boots first, black, shined to a mirror finish. The faultless uniform, starched and pressed. The chiseled face, the piercing blue eyes that bore down to the bottom of me.

"And so here you are," Vosch says softly. "Safe if not entirely sound. The doctors tell me you're extraordinarily lucky to have survived. No major damage; the bullet passed clean through. Amazing, really, given that you were shot at such close range."

What are you going to tell him?

I'm going to tell him the truth.

"It was Ringer," I tell him. You bastard. You son of a bitch. For months I saw him as my savior-as humanity's savior, even. His promises gave me the cruelest gift: hope.

He cocks his head to one side, reminding me of some bright-eyed bird eyeing a tasty morsel.

"And why did Private Ringer shoot you, Ben?"

You can't tell him the truth.

Okay. Screw the truth. I'll give him facts instead.

"Because of Reznik."

"Reznik?"

"Sir, Private Ringer shot me because I defended Reznik's being there."

"And why would you need to defend Reznik's being there, Sergeant?" Crossing his legs and cupping his upraised knee with his hands. It's hard to maintain eye contact with him for more than three or four seconds at a time.

"They turned on us, sir. Well, not all of them. Flintstone and Ringer-and Teacup, but only because Ringer did. They said Reznik's being there proved that this was all a lie, and that you-"

He holds up a hand. "'This'?"

"The camp, the infesteds. That we weren't being trained to kill the aliens. The aliens were training us to kill one another."

He doesn't say anything at first. I almost wish he would laugh or smile or shake his head. If he did anything like that, I might have some doubt; I might rethink the whole this-is-an-alien-head-fake thing and conclude I am suffering from paranoia and battle-induced hysteria.

Instead he just stares back at me with no expression, with those bird-bright eyes.

"And you wanted no part of their little conspiracy theory?"

I nod. A good, strong, confident nod-I hope. "They went Dorothy on me, sir. Turned the whole squad against me." I smile. A grim, tough, soldiery grin-I hope. "But not before I took care of Flint."

"We recovered his body," Vosch tells me. "Like you, he was shot at very close range. Unlike you, the target was a little higher up in the anatomy."

Are you sure about this, Zombie? Why do you need to shoot him in the head?

They can't know he's been zapped. Maybe if I do enough damage, it'll destroy the evidence. Stand back, Ringer. You know I don't have the best aim in the world.

"I would have wasted the rest of them, but I was outnumbered, sir. I decided the best thing to do was get my ass back to base and report."

Again he doesn't move, doesn't say anything for a long time. Just stares. What are you? I wonder. Are you human? Are you a Ted? Or are you...something else? What the hell are you?

"They've vanished, you know," he finally says. Then waits for my answer. Luckily, I've thought of one. Or Ringer did. Credit where credit is due.

"They cut out their trackers."

"Yours too," he points out. And waits. Over his shoulder, I see orderlies in their green scrubs moving along the row of beds and hear the squeak of their shoes along the linoleum floor. Just another day in the hospital of the damned.

I'm ready for his question. "I was playing along. Waiting for an opening. Dumbo did Ringer next, after me, and that's when I made my move."

"Shooting Flintstone..."

"And then Ringer shot me."

"And then..." Arms crossed over his chest now. Chin lowered. Studying me with hooded eyes. The way a bird of prey might its supper.

"And then I ran. Sir."

So I'm able to take Reznik down in the dark in the middle of a snowstorm, but I can't pop you from two feet away? He won't buy it, Zombie.

I don't need him to buy it. Just rent it for a few hours.

He clears his throat. Scratches beneath his chin. Studies the ceiling tiles for a little while before looking back at me. "How fortunate for you, Ben, that you made it to the evac point before bleeding to death."

Oh, you bet, you whatever-you-are. Fortunate as hell.

A silence slams down. Blue eyes. Tight mouth. Folded arms.

"You haven't told me everything."

"Sir?"

"You're leaving something out."

I slowly shake my head. The room sways like a ship in a storm. How much painkiller did they give me?

"Your former drill sergeant. Someone in your unit must have searched him. And found one of these in his possession." Holding up a silver device identical to Reznik's. "At which point someone-I would think you, being the ranking officer-would wonder what Reznik was doing with a mechanism capable of terminating your lives with a touch of a button."

I'm nodding. Ringer and I figured he'd go there, and I'm ready with an answer. Whether he buys it or not, that's the question.

"There's only one explanation that makes any sense, sir. It was our first mission, our first real combat. We needed to be monitored. And you needed a fail-safe in case any of us went Dorothy-turned on the others..."

I trail off, out of breath and glad that I am, because I don't trust myself on the dope. My thinking isn't crystal clear. I'm walking through a minefield in some very dense fog. Ringer anticipated this. She made me practice this part over and over as we waited in the park for the chopper to return, right before she pressed her sidearm against my stomach and pulled the trigger.

The chair scrapes against the floor, and suddenly Vosch's lean, hard face fills my vision.

"It really is extraordinary, Ben. For you to resist the group dynamics of combat, the enormous pressure to follow the herd. It's almost-well, inhuman, for lack of a better word."

"I'm human," I whisper, heart beating in my chest so hard, for a second I'm sure he can see it beating through my thin gown.

"Are you? Because that's the crux of it, isn't it, Ben? That's the whole ballgame! Who is human-and who is not. Have we not eyes, Ben? Hands, organs, dimensions, senses, affections, passions? If you prick us, do we not bleed? And if you wrong us, shall we not revenge?"

The hard angle of the jaw. The severity of the blue eyes. The thin lips pale against the flushed face.

"Shakespeare. The Merchant of Venice. Spoken by a member of a despised and persecuted race. Like our race, Ben. The human race."

"I don't think they hate us, sir." Trying to keep my cool in this strange and unexpected turn in the minefield. My head is spinning. Gut-shot, doped up, discussing Shakespeare with the commandant of one of the most efficient death camps in the history of the world.

"They have a strange way of showing their affection."

"They don't love or hate us. We're just in the way. Maybe to them, we're the infestation."

"Periplaneta americana to their Homo sapiens? In that contest, I'll take the cockroach. Very difficult to eradicate."

He pats me on the shoulder. Gets very serious. We've come to the real meat of it, do or die time, pass or fail; I can feel it. He's turning the sleek silver device over and over in his hand.

Your plan sucks, Zombie. You know that.

Okay. Let's hear yours.

We stay together. Take our chances with whoever's holed up in the courthouse.

And Nugget?

They won't hurt him. Why are you so worried about Nugget? God, Zombie, there are hundreds of kids- Yeah, there are. But I made a promise to one.

"This is a very grave development, Ben. Very grave. Ringer's delusion will drive her to seek shelter with the very things she was tasked to destroy. She will share with them everything she knows about our operations. We've dispatched three more squads to preempt her, but I'm afraid it may be too late. If it is too late, we'll have no choice but to execute the option of last resort."

His eyes burn with their own pale blue fire. I actually shiver when he turns away, cold all of a sudden, and very, very scared.

What is the option of last resort?