The thing was very close now, dark and hideous, spinning upside down and right side up again, corkscrewing as it sped toward them, faster and faster. Tick squinted, thinking the panic must have scrambled his brain—what he was looking at didn’t make any sense.

The poem had been more accurate than he’d thought. The train was not a train at all. It wasn’t a car, truck, or plane. It wasn’t even a spaceship. The thing thundering toward them at unbelievable speeds was an animal. The biggest, strangest, ugliest beast Tick had ever seen.

“What . . .” he said, trailing off, knowing his friends couldn’t hear him. Nothing made sense anymore. Nothing.

As the beast got closer, Tick felt the fear in him swell, burning like fire, surging through his veins, hurting him. The animal had at least a dozen sets of thick, muscled legs, almost a blur as they churned back and forth to move the creature in its twisting pattern. Its huge head spun but, impossibly, didn’t turn as quickly as the rest of its body, as if the legs were on springs or gears. Dark, scaly skin covered a hideous head, spikes and stunted bones sticking out in random places, enormous teeth jutting from its mouth.

As it approached within a half-mile, then a quarter-mile, Tick felt more scared than ever before, despite the things he’d been through. His mind couldn’t come up with any possible explanation why a gigantic glass tube would exist in the middle of the desert, made for a terrible beast to run through at ridiculous speeds. Confusion and fear mingled together inside his brain, squeezing his thoughts until his head pounded with a drumming pain.

Wink us away, he thought. Time’s almost up, wink us away. Wink us away. WINK US AWAY! The wind, the noise—the horrible noise. What is making that stupid noise? He thought he heard a scream, maybe two. Maybe it was him.

When the beast was only fifty feet away, growling and snapping its jaws and twisting and pumping its powerful legs, bulleting toward them, everything went crazy.

For the slightest of moments, a hush swallowed the area, the noise ending in an abrupt clap of empty silence. Then a booming, deep toll, like millions of huge bells and French horns playing at once, rang out, drowning out all other sound. Tick let go of Paul and Sofia and clapped his hands over his ears. The volume became unbearable; the ache in his head became a splitting pain behind his eyes.

The entire tunnel rocked upward and crashed back to the ground, sending a web of cracks shooting in all directions, spreading like a branching tree with the sound of ice breaking over a frozen lake. Tick crashed to the ground, his knees buckling from the impact; Paul fell on top of him, then Sofia.

Somehow Tick got out the words, “Stay in the box!”