The room was made of big river sandstone, worked roughly into rectangular blocks. They had been put together with mortar, so the room was waterproof.

Sam found Albrecht engrossed, standing beside Remi with his night vision goggles on and staring at the big piece of iron that had been burnished and then had Roman letters carved deeply into it. “Can you translate for us?” asked Sam.

“‘You have found my secret but have not begun to learn it. Know that treasures are buried in sadness, never in joy. I did not bury treasure once. I buried treasure five times. To find the last, you must reach the first. The fifth is the place where the world was lost.’”

Sam said, “Remi, your phone has a flash. You’d better get a shot of this.”

“But somebody could see it.”

“Unless you want to carry that chunk of iron to Szeged, we’ve got to chance it.”

She took off her night vision goggles, raised her cell phone, and took the picture. Then she said, “I’ll send this to Selma as soon as we’re aboveground and can send a signal.”

They all heard a sound like footsteps coming from above and froze in place, barely breathing. There was a voice, male, speaking quietly as he walked. Then someone laughed once, like a cough.

Sam jumped up, caught the end of the belt, and pulled it overhand. The spades came with it and dropped into his arms. They made a slight metallic noise, but he hoped it hadn’t been loud enough to reach the people above. He, Albrecht, and Remi crouched in the far end of the room, away from the entrance, waiting for the intruders to pass by the hole they had dug or come closer to examine it.

As the three watched, the steel slab was pushed across the opening, narrowing the faint rectangle of moonlight until it became a slit and then disappeared.

KISKUNHALAS, HUNGARY

THERE WAS THE SOUND OF DIRT BEING SHOVELED ONTO the iron slab that sealed the stone crypt. The shoveling continued. The first few loads of dirt were louder, and the ones after that quieter, but it was clear the dirt they had removed to dig down to the crypt was all being returned to the hole to cover it.

Sam whispered, “Stay still, and don’t use more oxygen than we have to.”

The three sat on the floor of the crypt, leaning against the stone walls, waiting. A half hour passed, then an hour.

“Do you hear anything?” whispered Remi.

“No,” Sam said. “I think they’ve gone.” Sam stood and moved to the space just below the slab of iron. “I think we can get out.”

“How?” asked Albrecht.

“We dug down about eight feet. The hole was eight feet wide and ten feet long—six hundred forty cubic feet. This room is ten feet wide, ten feet long, and ten feet deep. That’s a thousand cubic feet. We can let the dirt fall in here. We’ll spread it on the stone floor as it comes in and it will raise us as it does.”