Sofia groaned.

“That works for me,” Tick said. “If this door opens every half-hour or whatever, we don’t need to rush it. Next time, let’s just lean in real quick and take a look around. Hopefully there’ll be a walkway with a railing. If not, we’ll decide what to do from there.”

“Deal,” Paul said.

“Who’s going to poke their head in?” Sofia asked.

“All of us—it looks big enough,” Tick said. “Sofia, you look left. Paul, you look straight ahead. I’ll look to the right—and make sure you look down, too. Get in line and let’s get ready. Who knows when it’ll open next.”

They lined up in the order Tick had indicated and stood just inches from the invisible door in the shiny curved glass. The seconds dragged into minutes as Tick stared at his distorted reflection, trying to stay focused so he could lean forward the instant things changed. The sun had moved further west, but it still shone down with ruthless heat.

“What if the door closes before we pull out?” Paul said after what seemed like an hour of waiting.

Tick rolled his shoulders, surprised at how stiff his muscles were, tensed as he kept himself prepared to move. His injuries from the metaspides still stung as well. “Just count to three inside your head then pull back. It stayed open at least—”

The humming sound cut him off.

Tick tried not to blink as he stared at the unbelievable sight of the doorway opening. Like liquid silver, the glass melted and disappeared into itself, dropping in a straight line until a perfect rectangle once again revealed the inside of the tube.

“Now!” Tick said, but the other two were already leaning forward with him.

Everything felt different—the vrrmmmmm sound wasn’t as loud and nothing shook. Even as Tick’s head passed through the opening, he could see that no train or anything else was close by. Mentally counting to three, he stared across the tube and took it all in, hoping his friends were doing the same.

He saw no sign of rails or anything else to indicate train tracks. There wasn’t even a sunken floor running along the bottom. The inside of the structure looked much like the outside, a long tunnel of smooth glass almost completely unblemished by objects. It was much darker inside, the sunlight filtering into dark shades of blue and purple as it passed through. Here and there, small, odd-shaped formations of glass jutted into the tunnel. Tick had no idea what they were for.

Tick felt someone tugging on his shirt. He snapped back to his senses and jerked himself out of the tube. A second later, the humming sound returned as the glass magically formed upward, a gravity-defying sheet of molten crystal, and sealed off the doorway.

“Dang, Tick!” Paul said. “Weren’t you the one who said count to three?”

“Sorry—I just . . . I guess I lost track of time.”

“How do you lose track of three seconds?” Sofia said.

“Yeah, man—one more second and you’d have been running around here without a head.”

Tick ignored them, still fascinated by the inside of the tunnel. “So what did you guys see?”

“Glass,” Paul said. “A bunch of glass.”

“Me, too,” Sofia agreed.

Tick frowned, having hoped they would have seen something different. “No sign of a walkway or anything?”

Paul shook his head. “Just smooth glass with little things sticking out here and there—no idea what those were.”

Sofia nodded. “Below us the glass just curved toward the bottom in the middle then started back up again. It’s just a big glass tunnel. That’s it.”

Tick folded his arms and leaned back against the tube—a few feet away from the doorway, just in case. “What was that thing we saw zing past last time?” He wondered if maybe they’d gone to a Reality with extremely advanced technology, some form of travel they couldn’t even comprehend.

Sofia seemed to be on the same wavelength. “Maybe it’s some kind of futuristic invention—a train that slides through the tube at lightning speeds. Maybe this is a special kind of glass mixed with a metal we don’t know about and super-magnetized. Maybe.”

“Man, that sounded smart,” Paul said as he joined Tick, leaning against the tube.

Sofia put her hands on her hips and stared at them, as if picking out a criminal from a police lineup. “Okay, so what do we do?”

A long pause answered her. Tick finally broke the silence. “We go in.”

“Now, wait a minute—” Paul began.

“He’s right, Paul,” Sofia said. “What else can we do? We go in and let the door close behind us. Someone is testing our bravery. If we’re willing to just stand out here and roast to death, what good are we as Realitants?”

“What good are we if we get smashed by a big old train?” Paul retorted.

“Courage,” Sofia said. “Master George expects us to be brave.”

“He also expects us to be smart.”

“How about this?” Tick interjected. He stepped away from the tube. “We’ll wait until the door opens and we don’t feel the big vibration of the train-thing. The door opens every half-hour, but maybe the train only comes by at certain intervals. We’ve been here for at least three hours and we’ve only felt the vibration of the train twice.”

“I’m in,” Sofia said quickly.

They both looked at Paul, who took a long moment to think. “Fine—but only if there’s no doubt the train isn’t coming.”

“Sweet,” Tick said. “Line up again.”

They did, and time seemed to move slower than ever. When the door opened next, it was accompanied by the violent vibration of the traveling machine. Tick caught a blurry glimpse of the dark shape as it zipped past.

“See,” Sofia said. “It’s totally obvious when the train is coming. We can probably go in next time. If we don’t see or find anything in thirty minutes, we’ll just come back out.”

Again, the waiting game. Tick felt like the heat and the boredom were slowly driving his mind crazy; his stomach ached for food. He thought of his family, picturing each one in turn. Kayla, finally reading and loving every minute of it. Lisa, getting better at the piano and yapping on the phone constantly. His mom, the best cook he’d ever known—though old Aunt Mabel in Alaska was a close second. Finally, he pictured his dad: big belly, funny hair, gigantic smashed nose and all. Thinking of them made him feel a little better, but his heart panged with sadness as well.