The radioman proceeded to call the ship, but all his queries were met with silence. He checked the radio, then transmitted several more times.

“She’s not responding, sir,” he finally replied with a perplexed look. His experience with passing vessels in the Arctic was that they were usually prone to excessive chitchat from the isolated crews.

“Keep trying,” Weber ordered. “We’re nearly close enough for a visual ID.”

“Two kilometers off,” the helmsman confirmed.

Weber retrained his binoculars and examined the vessel. She was a relatively small containership of no more than four hundred feet. She was by appearance a newer vessel but oddly showed only a few containers on her topside deck. Similar ships, he knew, often carried containers stacked six or seven layers high. Curious, he studied her Plimsoll line, noting the mark was several feet above the water. Moving his gaze vertically, he looked at a darkened bridge, then at a masthead behind the superstructure. He was startled to see the Stars and Stripes fluttering in the stiff breeze.

“She’s American,” he muttered. The nationality surprised him, as American ships had informally boycotted the passage at the urging of their government. Weber focused the glasses on the ship’s bow, just making out the name ATLANTA in white lettering as the evening light began to fade.

“Her name is the Atlanta,” he said to Hopkins. The radio operator nodded and tried hailing the ship by name, but there was still no response.

Weber hung the binoculars on a metal hook, then located a binder on the chart table and flipped it open, searching for the name Atlanta on a computer printout. All non-Canadian vessels making a transit of the Northwest Passage were required to file notification with the Coast Guard ninety-six hours in advance. Weber checked to see that his fil e had been updated by satellite link earlier in the day but still found no reference to the Atlanta.

“Bring us up on her port bow. Hopkins, tell them that they are crossing Canadian territorial waters and order her to stop for boarding and inspection.”

While Hopkins transmitted the message, the helmsman adjusted the ship’s heading, then glanced at the radar screen.

“The channel narrows ahead, sir,” he reported. “Pack ice encroaching on our port beam approximately three kilometers ahead.”

Weber nodded, his eyes still glued to the Atlanta. The merchant ship was moving at a surprisingly fast clip, over fifteen knots, he guessed. As the Coast Guard vessel edged closer, Weber again observed that the ship was riding high on the water. Why would a lightly laden ship be attempting the passage? he wondered.

“One kilometer to intercept,” the helmsman said.

“Come right. Bring us to within a hundred meters,” the captain ordered.