“On average, eighteen feet. The Volga’s main channel is at least twice that. Plenty of room for us to maneuver as needed. Plus I have a hydrophone in the cockpit. I’ll hear any ships coming our way. If you’ll take your seats, we will be under way.”

Tucker sat on the forwardmost section of bench, and Kane settled in beneath it. The others spread out along its length, staring out portholes. With a soft whirring, the electric engines engaged, and the sub slid sideways away from the dock, wallowed a few times, then settled lower. The waters of the Volga rose to cover the portholes and flooded the sub’s interior in soft green light.

As Misha deftly worked the controls, the Olga glided out of the estuary and into the main river channel. They were still only half submerged.

“All hands prepare to dive.” Misha chuckled. “Or just sit back and enjoy.”

With a muffled whoosh of bubbles, the sub slid beneath the surface. The light streaming through the portholes slowly dimmed from a mint green to a darker emerald. Soft halogen lights set into the underside of the benches glowed to life, casting dramatic shadows up the curved bulkheads.

After a few moments, Misha announced in his best tour-guide voice, “At cruising depth. We are under way. Prepare for a smooth ride.”

Tucker found his description to be apt. They glided effortlessly, with very little sense of movement. He spotted schools of fish darting past their portholes.

Over the next hour, having slept fitfully over the past days, exhaustion settled over everyone. The others drifted away one by one, draped across the bench, each with a wool blanket and inflatable pillow.

Tucker held off the longest, but after a quiet conversation with Misha who assured him all was well, he curled up and went to sleep, too. He hung one arm over the side of the bench, resting his palm on Kane’s side. The shepherd softly panted, maintaining his post beside the floor’s porthole, studying every bubble and particle that swept past the glass.

1:00 P.M.

Tucker startled awake as Misha’s voice came over the loudspeaker.

“Apologies for the intrusion, but we are about to make our first stop.”

The others groaned and stirred.

Tucker sat up to find Kane curled on the bench with him. The shepherd stood, arched his back in a stretch, then hopped down, and trotted to the entrance of the cockpit.

“Tell your friend he cannot drive,” Misha called good-naturedly.

“He just likes the view,” Tucker replied.

Bukolov waddled forward and sat down beside Tucker. “I must say, you impress me.”

“How so?”

“I had my doubts that you could truly help me—us—escape Russia. I see now that I was wrong to doubt you.”

“We’re not out yet.”

“I have faith,” Bukolov said with a smile. He gave Tucker’s arm a grandfatherly pat, then returned to his section of bench.

Miracles never cease.

He felt his ears pop as the Olga angled toward the surface. The portholes reversed their earlier transformation, going from a dark green to a blinding glare as the sub broached the surface. Sunlight streamed through the glass. A moment later, forward progress slowed with a slight grinding complaint as the hull slid to a stop on sand.

Misha crawled out of the cockpit, climbed the ladder, and opened the hatch. “All ashore!”

They all abandoned ship.

Misha’s expert piloting had brought the Olga to rest beside an old wooden dock. Their tiny cove was surrounded by tall marsh grass. Farther out, up a short slope, Tucker could see treetops.

“Where are we?” Utkin asked, blinking against the sun and looking around.

“A few miles north of Akhtubinsk. We’re actually ahead of schedule. Feel free to walk around. You have thirty minutes. I’m going to partially recharge the batteries with my solar umbrella.”

Tucker crossed with Kane to the shore and surveyed the immediate area around the dock. He had Kane do a fast scout to make sure they were alone. Once satisfied, he waved the others off the dock so they could stretch their legs.

“Stay close,” he ordered. “If you see anyone, even in the distance, get back here.”

Once they agreed, Tucker headed back to the sub. Misha had the solar umbrella already propped over the sub, recharging the batteries.

As Misha worked, he asked, “Tell me, my friend, are you all criminals? I do not judge. You pay, I don’t care.”

“No,” replied Tucker.

“Then people are following you? Looking for you?”

“Not anymore.”

I hope.

Misha nodded, then broke into a smile; his gold teeth flashed in the sun. “Very well. You are in safe hands.”

Tucker actually believed him.

Anya returned early by herself and prepared to return below.

“Where are the others?” he asked.

“I . . . I did what I had to do,” she said, blushing a bit. “I left the boys so they could have some privacy to do the same.”

Tucker glanced down to Kane. It wasn’t a bad idea. It would be another four hours before they stopped again. “How about it, Kane? Wanna go see a man about a horse?”

2:38 P.M.

As the Olga continued to glide down the Volga, the group dozed, stared out the portholes, or read. Occasionally Misha would quietly announce landmarks no one could see: a good spot for sturgeon fishing, or a mecca for crawfish hunting, or a village that had played a major or minor part in Russian history.

Utkin and Anya traded scientific journals and pored over them. Bukolov studied his notes, occasionally stopping to scribble some new thought or idea.

With nothing else to do himself, Tucker drifted in a half drowse—until Bukolov abruptly slid next to him and nudged him alert.

“What do you make of this?” the doctor said.

“Pardon?”

Bukolov pushed a thin journal into his hand. It was clearly old, with a scarred leather cover and sewn-in yellowed, brittle pages. “This is one of De Klerk’s later journals.”

“Okay, so?”

Bukolov took it back, scowled at him, and flipped the pages back and forth. He then bent the book open, spread it wide, and pointed to the inner seam. “There are pages missing from this last diary of De Klerk’s. See here . . . note the cut marks near the spine.”

“You’re just noticing this now?” Tucker asked.

“Because the entries seemed to follow along smoothly. No missed dates, and the narrative is contiguous. Here, just before the first missing pages, he talks about one of the men in his unit complaining of mysterious stomach pains. After the missing pages, he begins talking about his Apocalypse Seed—where he found it, its properties, and so on.”

Not able to read or speak Afrikaans, Tucker had to take the doctor’s word for it, but the man was right. The cut marks were there.

“Why would he do this?” Tucker asked.

“I can only think of one reason,” Bukolov replied. “Paulos de Klerk was trying to hide something. But what and from whom?”

7:55 P.M.

Misha announced another pit stop and guided the Olga toward shore. It was the third landfall of the day, near sunset. He wanted one more chance to stock up his solar batteries for the night. He pulled them up to another abandoned fishing dock. Clearly he had planned their route carefully, choosing backwater locations for their ports of call.

As the hatch was unsealed, Tucker was immediately struck by the cloying rotten-egg stench of the place, undercut by a heady mix of petroleum and burned oil.

“Ugh,” Anya said, pinching her nose. “I’m staying inside. I don’t have to use the bathroom that badly.”

Tucker did, as did Kane. So they headed out with Utkin and Bukolov.

The cove here was surrounded by swamp, choked with densely packed grasses and reeds, interspersed with dead dwarf pines. A maze of wooden boardwalks zigzagged through the marshy area, paralleling aboveground pipes. At several intersections, car-sized steel cones protruded out of the oil-tinged water.