“And are we looking for animal, vegetable, or mineral?” Dahlgren asked through his headset, his teeth mashing a large wad of gum.

“All three,” Dirk replied. “Carl Nash told me that a toxic cloud could be created by anything from an active volcano to an algae bloom, not to mention your garden-variety industrial pollutant.”

“Just stop at the next walrus and I'll ask for directions to the closest pesticide factory.”

“That reminds me, where's Basil?” Dirk asked, his eyes glancing about the cockpit.

“Right here, safe and sound,” Dahlgren replied, grabbing a small cage from beneath his seat and holding it up in front of his face. Inside, a small white mouse peered back at Dahlgren, his tiny whiskers twitching back and forth.

“Breathe deep, little friend, and don't go to sleep on us,” Dahlgren requested of the furry rodent. He then strung the cage from an overhead lanyard, like a canary in a coal mine, so they could easily see if the mouse succumbed to any toxins in the air.

The grassy island of Yunaska crested out of the slate green water ahead of them, a sprinkling of light cirrus clouds dancing about the larger of the island's two extinct volcanic peaks. Dirk gradually increased the helicopter's altitude as they approached the craggy shoreline, then banked left along the water's edge. Flying counterclockwise around the island's perimeter, it took only a few minutes before they spotted the yellow building of the Coast Guard station. Bringing the helicopter to a hover, Dirk and Dahlgren carefully examined the ground surrounding the station for any unusual signs. Dirk eyed the body of Max the husky still lying outside the hut's door and it brought back to mind the look of pain and horror on the dead men's faces inside when he and Dahlgren first landed at the station earlier in the day. He carefully shelved his emotions and shifted his mental motor to discovering the source of the deadly toxic breeze.

Dirk nodded past the windscreen to the right. “The prevailing winds come from the west, so the source would likely have come from farther up the coast. Or possibly from offshore.”

“Makes sense. The CDC team was camped to the east of here and they obviously caught a less lethal dose of the mystery gas,” Dahlgren replied while peering at the ground through low-power binoculars.

Dirk applied a gentle force to the cyclic control lever and the helicopter edged forward and away from the yellow structure. For the next hour the two men strained eyeballs searching the grassy island for signs of a natural or man-made origin to the toxin. Dirk traced wide semicircular arcs north and south across the island, expanding their way west until they reached the western coast and returned to the vicinity of the Coast Guard station.

“Nothing but grass and rocks,” Dahlgren grumbled. “The seals can keep it, as far as I'm concerned.”

“Speaking of which, take a look down there,” Dirk replied, pointing to a small gravel beach ahead of them.

A half-dozen brown sea lions lay stretched out on the ground, seemingly enjoying the rays of the late afternoon sun. Dahlgren looked closer his forehead suddenly wrinkling in puzzlement.

“Geez, they're not moving. They've all bought it, too.”

“This thing must not have come from Yunaska but from the sea, or the next island over.”

“Amukta is the next rock pile to the west,” Dahlgren replied, running his finger across a chart of the region.

Dirk could clearly see the dirty gray outline of the island on the horizon. “Looks to be about twenty miles from here.”

Eyeing the helicopter's fuel gauge, he continued, “I think we've got time for a quick gander before our fuel runs low. Okay if you miss your pedicure treatment in the ship's salon?”

“Sure I'll just reschedule it with my body wrap tomorrow,” Dahlgren replied.

“I'll let Burch know where we're headed,” Dirk said, dialing up the ship's radio frequency.

“Tell him to hold supper in the galley,” Dahlgren added while rubbing his stomach. “I'm working up an appetite taking in all this scenery.”

As Dirk radioed the survey ship, he guided the Sikorsky toward the island of Amukta, skimming low over the open water. The powerful helicopter, designed for offshore oil transport, flew straight as a rail under Dirk's firm hand. After cruising steadily for ten minutes, Dahlgren quietly lifted an arm and pointed out the cockpit window to an object on the horizon. It was a white speck, growing larger by the second, until it slowly revealed itself as a large boat complete with trailing wake. Without a word, Dirk applied gentle pressure to his left pedal control until the helicopter eased about on the same line as the boat. Approaching rapidly, they could see it was a steel-hulled fishing trawler, running to the southwest at full bore.

“Now, there's a tub calling out for a little spit and polish,” Pitt remarked as he eased off the throttle to match speeds with the boat.

Though not appearing particularly old, the fishing vessel had obvious signs of hard use over the years. Scrapes, dents, and grease marks abounded both on the hull and throughout the open deck. Its original coating of white paint was worn thin in the spots where rust had not yet declared victory. By outward appearance, she looked as tired as the frayed bald tires hanging over her sides like a string of donuts. Yet like many disheveled-appearing work boats her twin diesel engines were newly rebuilt and pushed the hulk hard through the waves with a barely a wisp of black smoke from the funnel.

Dirk studied the boat carefully, noting with interest that no flags flew from the mast, which might identify nationality. Both the bow sides and the stern were absent a ship name or home port. As he perused the stern deck, two Asian men in blue jumpsuits stepped into view and peered at the helicopter with looks of angst.

“Don't look overly friendly now, do they?” Dahlgren remarked before waving and grinning toward the boat. The two jumpsuits simply scowled in return.

“You wouldn't be, either, if you worked on that mangy derelict,” Dirk said as he steadied the Sikorsky in a hover just aft of the churning boat. “Anything strike you as odd about that fishing boat?” he asked, eyeing the stern deck.

“You mean the fact that no fishing equipment is anywhere to be seen?”

“Precisely,” Dirk replied, inching the helicopter closer to the boat. He noted an odd trestle mounted in the center of the deck, built up approximately fifteen feet high. No streaks of rust could be seen on the metal framing, indicating it was a recent addition to the boat. In a star-shaped pattern at the base of the trestle was a gray powdery marking that appeared singed into the surface of the deck.

As the helicopter crept closer, the two men on deck suddenly began jabbering animately with each other, then ducked down a stairwell. At the head of the stairwell, five sea lion carcasses were stretched out on the deck side by side like sardines in a tin. To the left of the corpses was a small steel pen, which contained three live sea lions.

“Since when has the demand for seal blubber surpassed the market for crab legs?” Dahlgren said idly.

“Not sure, but I don't think Nanook of the North would be too happy about these guys stealing his dinner.”

Then came the flash of fire. Dirk detected it out of the corner of his eye and instinctively pressed hard on the left foot pedal, throwing the Sikorsky into a quick half spin. The move saved their lives. As the helicopter began to turn, a spray of bullets found their mark and burst into the machine. But rather than smashing into the forward section of the cockpit, the hail of fire entered in front of the pilots and ripped into the instrument panel. The console, gauges, and radio shattered into bits, but the pilots and critical mechanical components went unharmed.

“Guess they didn't like the Nanook comment,” Dahlgren dead-panned as he watched the two men in jumpsuits reappear and fire into the helicopter with automatic rifles.