“Open the hatch.” Mark was already on the move, the world a haze around him. He grabbed Deedee out of Trina’s lap far more roughly than he meant to, ignoring the little girl’s cries of protest. Holding her in his arms, he moved toward the exit, Trina on his tail. She hadn’t said a word or lifted a finger to stop him.

At the cockpit’s door, Mark paused. “You know … what to do … when I’m done,” he said to Alec, words a struggle now. “If it’s there or not, you know what to do.” Without waiting for a response, he marched into the hallway.

Deedee calmed as he headed for the cargo room and the exit beyond that. Her arms tightened around his neck and she buried her face into his shoulder. As if understanding had dawned, even for her, that the end was here. Spots swam before Mark’s eyes, flashing lights. His heart wouldn’t stop racing, and it felt as if the organ pumped acid through his veins. Trina, silent, kept up with him.

Into the cargo room. Down the ramp of the hatch door, into the brightness of day. They’d barely stepped off of it when squeals pierced the air and the slab of metal began to close. Alec lifted the Berg off the ground, blue thrusters roaring. Mark was barely holding onto his mind, but he felt a sudden, unbearable sadness. He’d never see the old bear again.

The sun sweltered in the sky. There was a rising rumble of shouts and whistles and marching. Groups of the infected were approaching from all directions. Far off, through the display of lights flashing before his eyes, Mark thought he could see Bruce and his red flag leading his own charge. If these people got to the Flat Trans before someone shut it down or destroyed it …

“Come on,” he grunted to Trina.

The wind from the ascending Berg blew across them as he ran over to the entrance of the building, its doors still open. Deedee clung to him and Trina was right by his side. They went through the entrance into a wide room with no furniture. Only a strange object right in the center—two metallic rods, standing tall, with a shimmering wall of gray stretched in between them. It appeared to be moving and sparkling, yet still and serene at the same time. It hurt Mark’s eyes to stare at it.

A man and a woman were standing next to it, looking back at Mark and his friends with fear in their eyes. They were already moving toward the grayness.

“Wait!” Mark yelled.

They didn’t respond, didn’t stop. The two strangers leaped into the abyss and vanished from sight. On instinct, Mark sprinted to the other side of the gray wall, yet there was nothing there.

A Flat Trans. For the first time in his life, he’d actually seen someone travel through a Flat Trans. The noise of the approaching crowds outside seemed to tick up a notch, and Mark knew he was out of time. In so many ways.

He walked back over to the proper side of the Flat Trans and kneeled right before it, gently placing Deedee on her feet. It took every last ounce of his effort to remain calm and keep his swirling emotions and anger and madness at bay. Trina knelt as well, though she said nothing.

“Listen to me,” Mark said to the girl. He stopped, closed his eyes for a second, fought off the darkness that tried to consume him. Only a little longer, he told himself. “I need … you to be really brave for me now, okay? There’re people on the other side of this magic wall that … are going to help you. And you’re going to help them. You’re going to help them do … something really important. There’s … something special about you.”

He didn’t know what he expected. For Deedee to protest, to cry, to run away. But instead she looked him in the eye and nodded. Mark’s head wasn’t clear enough to understand how she could be so brave. She was special.

He’d almost forgotten about the note he’d scribbled earlier. He pulled it out of his back pocket, read it one more time, his hand shaking.

She’s immune to the Flare.

Use her.

Do it before the crazy people find you.

He gently reached out for Deedee’s hand and scrunched the paper up into her palm. Closed her fingers around it. Squeezed her hand with both of his. The shouts and calls from outside grew to a crescendo. Mark spotted Bruce charging the door, a mass of people behind him. Mark’s entire body washed with sadness. He nodded at the Flat Trans. Deedee nodded back.

Then she and Trina were hugging fiercely. Both of them shed tears. Mark was on his feet. He heard the unmistakable sound of the Berg’s thrusters returning. Noticed a wind picking up outside. The time had come.

“Go, now,” he said, fighting the emotions that tore through him.

Deedee pulled away from Trina and turned, ran into the gray wall of the Flat Trans. It swallowed her whole and she was gone. The roar of the Berg filled the air. The building trembled. Bruce arrived at the door, screaming something unintelligible.

And then Trina was rushing to Mark. Throwing her arms around his neck. Kissing him. A thousand thoughts flipped through his mind, and he saw her in all of them. Wrestling in the front yard of her house before they were old enough to know anything; saying hi in the school hallway; riding the subtrans; feeling her hand in the darkness after the flares struck; the terror of the tunnels, the rushing waters, the Lincoln Building; waiting out the radiation, stealing the boat, the countless treks across ruined, sweltering land. She’d been there with him through it all. With Alec. Lana. Darnell and the others.

And here, at the end of the fight, Trina was in his arms.

Monstrous noise and quaking took over the world, but he still heard what she whispered into his ear before the Berg came crashing into the building.

“Mark.”

EPILOGUE

TWO YEARS LATER

A single lightbulb hung from the apartment’s drab ceiling, buzzing every ten seconds or so. Somehow, it seemed to represent what the world had become. Lonely, noisy, dying. Barely holding on.

The woman sat in her chair, trying desperately not to cry.

She’d known the knock was coming far before it happened. And she wanted to be strong for her son. Make the boy think that the new life that awaited him was a good thing. A hopeful thing. She had to be strong. When her son—her only child—was gone, then she’d let it out. Then she’d cry a river’s worth until the madness made her forget.

The boy sat next to her, quiet. Unmoving. Only a child, and yet it seemed he understood that his life would never be the same. He had a small bag packed, though the woman assumed its contents would be discarded before her son reached his final destination. And so they waited.

Their visitors tapped the door three times. There was no anger behind it, or force. Just tap, tap, tap, like the gentle pecking of a bird.

“Come in,” she said, so loud it startled her. Nerves. She was on the edge.

The door opened. Two men and one woman stepped inside the small apartment, dressed in black suits, protective masks covering their mouths and noses.

The lady seemed in charge.

“I can see you’re ready,” she said, her voice muffled, as she walked forward and stood before the woman and her son. “We appreciate your willingness to make such a sacrifice. I don’t need to tell you how much this means to future generations. We’re on the cusp of a very great thing. We will find the cure, ma’am. I give you my word.”

The woman could only nod. If she tried to speak, it would all come out: Her pain, her fear. Her anger. Her tears. And then her efforts to be strong for the boy would have been for naught. So she kept it in, a dam against a raging river.

The lady was all business. “Come,” she said, extending a hand.

The boy looked up at his mother. He had no reason to hold back the tears, and he didn’t. They flowed down his face freely. He jumped to his feet and hugged her, shattering her heart a million times over. She squeezed him back.

“You’re going to do great things for this world,” she whispered, somehow keeping herself under control. “You’re going to make me so proud. I love you, sweet boy. I love you so much and don’t you ever forget it.”

His only response was to sob into her shoulder. And that said everything.

Finally it had to end.

“I’m very sorry,” the lady in the dark suit and mask said. “But we have a tight schedule. Truly, I’m sorry.”

“Go on now,” the mother said to her son. “Go on, and be brave.”

He pulled back, his face wet, his eyes red. A strength seemed to come over him and he nodded, helping her believe he’d be okay in the end. He was strong, this one.

The boy turned away, never to look at her again. He walked to the door and went through it with no hesitation. No glance back, no complaints.

“Thank you again,” the visiting lady said. She followed the boy out.

One of the men looked up at the dangling, buzzing lightbulb, then turned to his partner. “You know who invented those things, right? Maybe we should call this one Thomas.” And then they left.

When the door closed, the woman curled up into a ball and finally let her tears come.