Linda’s responsibility on this mission was to keep the mini-sub on-station while MacD and Mike climbed the side of the tanker with the Corrodium and delivered it into the holds using the ship’s own deck piping system.

But they couldn’t get on the ship while it was moving. Even if they could match the tanker’s speed, maneuvering the Discovery next to it and keeping it stable while MacD and Mike tried to disembark was a recipe for disaster. They had to get the Sorocaima to stop.

Disabling the tanker in any way was out of the question. It might be tugged back to port, instead of going on to North Korea, and investigators might realize the damage was intentional, prompting questions about who had done it and why. Stealth was the only option, and it had a side benefit as well. If the North Koreans blamed the Venezuelans for the contamination, it would make them less likely to trust their suppliers for future diesel shipments.

It was Max as usual who had used his engineering expertise to devise a way to get a tanker to stop without hijacking or damaging it.

The Discovery’s robotic arms cradled an apparatus the size and shape of a coffin, flat on the long sides, with watertight Plexiglas sealing the ends and an uninflated tube on top. A filament connected the object, which they called the beatbox, to a control system inside the mini-sub. When attached to the hull, the beatbox, which was equipped with a high-impact rotating hammer, would knock with each rotation of the propeller shaft.

No captain likes to be stranded in the middle of the ocean with a dead engine, so the mechanical systems are tuned and maintained rigorously to run at peak operating efficiency. If the engineer heard a pounding in the engine room that couldn’t be located, he would recommend that they stop the ship until the problem could be diagnosed. Of course, in this case there wouldn’t be a problem at all, and the onboard instrumentation would tell them that. Max estimated they would have thirty minutes before the engineer deemed the engines safe and cranked them back up.

“Hold on, boys,” Linda said. “We’re heading under.”

She flicked the joysticks expertly and dived the sub, maneuvering the Discovery so that it was below the path the Sorocaima would take. The rush of water being pushed by the immense tanker’s bow grew until it sounded as if the sub were a barrel floating toward Niagara Falls.

Using the onboard LIDAR, or light detection and ranging system, which relied on a series of reflected lasers that would re-create a three-dimensional image of anything they saw, Linda could see the tanker’s hull soar over them like a zeppelin drifting through the clouds.

Linda clicked on her on-screen control and the tube on top of the beatbox inflated until it made the apparatus neutrally buoyant. She retracted the robotic arms and then backed the Discovery away, unspooling the filament control wire as she did. She stopped when she was a hundred yards away.

The positioning was perfect. The beatbox hovered twenty feet below the centerline of the tanker.

The tanker’s gigantic single screw thrashed as it got closer. Linda would have to time this right. Too early and she’d get the beatbox too far forward of the engine room to be mistaken for a problem with the turbine. Too late and she’d get the beatbox chewed up by the screw or miss the tanker entirely. If that happened, there was no way the sub would be able to catch up and try again.

When the last hundred feet of the tanker passed overhead, she clicked another button, activating the powerful magnet on the beatbox. It flipped as the magnetized side was pulled by the steel hull of the Sorocaima. A loud bang signaled that the beatbox had made contact and was holding fast to the tanker only four feet from where Linda had been aiming.

The filament continued to feed out. She clicked another button and the hammer inside the beatbox started to pound away. She nudged the joysticks forward to the sub’s maximum speed so that they would be as close as possible when the tanker came to a stop.

“Keep your fingers crossed,” she said.

There was an agonizing wait as she looked for any signs that the tanker was slowing. A thousand yards of the filament had already played out. They had three thousand to go. After that, she’d have to cut it loose.

Another thousand yards came and went before she finally saw the unspooling of the filament slowing down.

“Good old Max,” she said.

“I knew he wouldn’t let us down,” Mike said, rechecking the pistol that he was bringing along as a precaution even though their mission was to avoid any contact.

“Looks like we’re going to have ourselves a cliff face to tackle,” MacD said, and assembled their climbing gear.

When the Discovery caught up with the now stationary tanker, Linda’s watch told her that they had twenty-five minutes left out of Max’s thirty-minute limit. She surfaced the Discovery next to the bow, as far as possible from the engine room and bridge, where the center of activity would be taking place right now.

MacD popped the hatch and looked outside. When he came back in, he wore a grim expression.

“We’ve got something of a problem,” he said.

Linda leaned forward and peered up through the mini-sub’s front viewport. She immediately saw what MacD meant.

They were expecting the Sorocaima to be dark except for its running lights, the cloud cover allowing Mike and MacD plenty of pitch-black areas of the deck to move through unnoticed. That would be impossible now. From stem to stern, the tanker was lit up like a Christmas tree.

Red battle station lighting bathed the bridge of the frigate Mariscal Sucre in a hellish splendor that Admiral Dayana Ruiz relished. She had risen to her position as the top-ranking woman in the Venezuelan military not only because of her refusal to accept anything less than perfection from her subordinates but also because of her ability to command a ship in battle. She had never lost a war game exercise, and now she had the opportunity to show off her skills in actual combat.

She only hoped that the ship called Dolos was as formidable as the stories had claimed. The tip she’d received about the tramp freighter and its captain had come from an officer in the Libyan Navy she had met at an arms bazaar in Dubai. He told her that he had experienced the mythical ship’s capabilities firsthand when it had nearly destroyed his frigate, the Khalij Surt—the Gulf of Sidra. Although she’d heard secondhand tales of such a covert ship, she had previously dismissed them as fantasy. But the officer’s eyewitness account was compelling. She spread word throughout the naval community that she would be happy to bag the mystery ship as a prize.

Then Gao Wangshu of the Chinese Navy had come to Ruiz with a story similar to the Libyan’s. He had intelligence that the ship would be coming to Venezuela, although he thought the port of call would be Puerto Cabello. At the last minute, he gave word that La Guanta was where it would dock, and she sent him to the harbormaster there to get confirmation it was the right ship.

Now it seemed like she had even more reason to believe the Dolos was a spy ship. The call from Lieutenant Dominguez about the two impostors who had tied him up couldn’t be a coincidence.

Ruiz finished her black coffee as she angrily waited for the phone call from Puerto La Cruz. She wanted to fling the mug against the window, but the rigid reflection staring back at her made her stop. Her short raven hair, tan angular face, and tall, ramrod-straight frame under an immaculately pressed uniform, projected the reputation she had as an ice-cold commander, ready to sacrifice anyone or anything for victory. Any histrionics would dispel that image and allow the macho Latin American men under her command an opportunity to question her ability. She would not let that happen, but these latest developments were testing her stoicism.