Nick, however, did not sleep. He was emotionally exhausted, and should have, at the very least, taken some time to rest, but there was too much on his mind. There were things that simply weren’t sitting right, and he knew he wouldn’t be able to relax until he figured them out.

High up in the girders of the airship, Nick sat on a catwalk, in front of the bucket of coins that Mary had left in his care.

Lief found him up there, and sat across from him.

“They’re mine, you know,” Lief said. “I found them.”

“I thought you didn’t care about things like that anymore.”

“I don’t,” said Lief, “I’m just saying.”

Nick pulled out one of the coins. It was so worn there was no way of telling what kind of coin it was, what country it had come from, or what year it was made. They were all like that—even the one he had found in his pocket way back when—the one he had used to make a wish in Mary’s fountain. Funny how both the McGill and Mary had a collection of these coins.

As he held the coin, cool in his palm, Nick could have sworn it felt a little different. It felt almost … electrified … like a fuse completing a circuit.

That’s when an understanding began to come to Nick—an understanding that Nick instinctively knew was the tip of something very big and very important. He took the coin from his palm, and held it between thumb and forefinger.

“Did you know,” Nick told Lief, “that they used to put coins on dead people’s eyes?”

“Why?” asked Lief. “To keep their eyelids from opening and making people scream?”

“No—it was this old superstition. People used to think that the dead had to pay their way into the afterlife. The ancient Greeks even believed there was this ferryman you had to pay to take you across the river of death.”

Lief shrugged, unimpressed. “I don’t remember any ferry.”

Neither did Nick. But then, maybe people saw what they expected to see. Maybe the ancient Greeks saw a river instead of a tunnel. Maybe they saw a ferry instead of a light.

“I have an idea,” Nick said. “Give me your hand.”

Lief held out his hand. “Are you going to do a magic trick? Are you going to make the coin disappear?”

“I don’t know,” said Nick. “Maybe.” He put the coin in Lief’s palm, then folded Lief’s fingers around it until the coin was firmly in his closed fist. “How does it feel?”

“It’s warm,” said Lief. “It’s really warm.”

Nick waited and watched. A moment passed, then another, and then Lief suddenly looked up and gasped. Nick followed his gaze, but saw nothing—just the girders and hydrogen bladders of the airship.

“What is it? What do you see?”

Whatever it was, Lief was too enthralled to answer. Then, when Nick looked at Lief’s eyes, he saw something reflected in his pupils. It was a spot of bright light, growing larger and brighter.