As he continued up the rails, out of the mine, he recalled the cops who’d been watching him. Rather than get caught with the broken link if they made him turn out his pockets, he slipped it into a crack between a prop and the coal seam and noted the spot carefully in his memory — four support props above the lowest side gallery.

He started up. Or was it three? He went back, counted again, touching each. Four. The hairs prickled on the back of his neck. He had a photographic memory. How could he forget a picture so simple as these four ceiling props standing in a row? He noticed a strange silence. Something had changed in the narrow passages. The ventilators had stopped blowing fresh air.

The damps were gathering again. No wonder he felt light-headed. Bell turned and stumbled upward, toward the distant mouth. If it was blackdamp, he hadn’t a prayer. The carbonic acid would stop him within seconds. White damp from the extinguished fire? Minutes. Less than ten.

He broke into a shambling run. His head was pounding and his heart hammered in his chest. He imagined the poison gases chasing after him, breaking like a tidal wave, cresting, splashing, clutching his boots, his knees, tugging at his legs, suction pulling him under. He ran harder, his fading light bouncing low shadows from the crossties. Two ties for each step. He made himself stretch for three longer strides, flowing over the floor of the mine faster than the wave crashing after him.

He was pulling ahead when he saw something gleam in his light. It was tucked against the right rail, half obscured by a wooden tie. He slowed, stopped, stared down at it, desperately trying to mine thoughts from a heavy head. The shackle? Did he imagine it? Or did he see a piece of it directly under his feet? Should he try to pick it up? He had the feeling that if he knelt to pick it up, he might never stand again. His head was spinning. But it was important. The saboteur… He gathered his strength and dropped to one knee. Before he could reach it, it disappeared in a shadow that moved over it.

Isaac Bell turned his head to see what caused the shadow.

He sensed motion and found himself looking into golden eyes as simultaneously remote and intent as those of a wolf that had fixed on its prey. The jaws between the eyes formed a fist. The white damp had rattled his mind. He had to stand up. He had to run. The fist traveled at his face with the speed and power of a locomotive. Bell’s own fists leaped automatically to block and counterpunch. Then he heard an explosion, deep in his head, and then he saw nothing.

Isaac Bell awakened to a current of cool air fanning his face.

He was flat on his back on the ties between two rails. An electric bulb blazed down from the rough-hewn ceiling of coal. His head ached, his jaw was sore, and as he sat up and looked around he recalled the ventilators stopping and him running from the damp. The fans were running again, the air just fresh enough to revive him. He climbed to his feet and started up the sloping haulageway, his mind shambling through dreamlike memories.

He had found the broken link of the bridle chain. He had hidden it in a crack between the tunnel wall and a roof prop. Fourth prop above the deepest gallery. He had looked for the missing shackle. He hadn’t found it. Or had he? Thoughts cascaded. He had seen it. He hadn’t seen it. He saw amber eyes. He saw a shadow. He saw a ghostly fist. His head ached. So did his jaw. He had fallen hard. And the only thing he knew for sure was that he was very lucky that the fans had started up again before the damps suffocated him.

Ahead, he saw the light of the mouth. He quickened his pace.

“Where the heck did you come from?”

Some miners rigging new electrical wires were staring at him.

Bell jerked a thumb in the general direction of the depths of the mountain and said, “Tell the mechanician boys who fixed them ventilators I’m going to buy ’em a drink.”

Hundreds of men were waiting to enter the mine and go back to work. Bell melted into the crowd, avoiding the company cops, slipped out the gates, and hurried toward the telegraph office. Dodging the goats that roamed Gleasonburg’s Main Street, a shanty-lined dirt road rutted by wagon wheels and reeking of sewage, he pondered the telegram that he would send to Joseph Van Dorn.

Who would sabotage a mine? No union man in his right mind would murder his own people. Certainly not the mild-mannered Jim Higgins who preached moderation. But if not the union saboteurs he had been ordered to hunt — criminals who he was now firmly convinced did not exist — then who? Could they be the owners of the mine? But the owners had everything to lose if they couldn’t dig coal. This disaster could have been much worse. Hundreds could have died. The mine could have been blocked for months instead of days.

But if not the union and not the owners, who?

With that unanswered, Bell turned his thoughts to a stranger mystery. It certainly appeared that a saboteur had chiseled the chain apart. But at the moment when the chain had fractured, the coal train had been climbing to the tipple in plain sight of hundreds of miners. Not one of them, Isaac Bell himself included, had seen a blacksmith riding the lead coal car, attacking the bridle chain with hammer and chisel.

Isaac Bell took two baths upon arriving in Pittsburgh, Pennsylvania, the first at the five-cent lodging house where he had left his bags and scrubbed off enough coal dust to gain admittance to the city’s exclusive Duquesne Club — an ornate Romanesque Revival building that dominated the Golden Triangle where the Monongahela joined the Allegheny to form the Ohio River — the second bath at the Duquesne Club before donning an immaculate white suit.

He asked the front-hall porter to escort his lunch guest, Mr. Van Dorn, to the bar when he arrived. Then the young detective shouldered into the favorite watering hole of the industrial barons and railroad tycoons who ruled the capital of America’s coal and steel empire. Having researched the coal industry meticulously, he recognized many in the enormous room. But the man who captured his attention right off was holding court under an acanthus-leaf-carved mantel topped by life-size mahogany satyrs — John “Black Jack” Gleason, ruthless owner of the Gleason Consolidated Coal & Coke Company.

If the day before yesterday’s runaway train, explosion, and deaths of six doorboys in Mine No. 1 troubled Gleason at all, it did not show. Instead, he was taunting his fellow barons, with a grin like the satyrs’: “When I drive the union out of West Virginia, my mines will sell coal cheaper than every man in this room. I’ll take your customers.”

A patrician turned red in the face. “My grandfather was a founding member of this club, sir, and I do not hesitate to tell you that you are a vulture!”

“Proud of it,” Gleason fired back. “If you don’t stick with me against the union, I’ll buy your bones at bankrupts’ auction.”

The founder’s grandson stormed out. But the others, Bell noticed, murmured compromisingly, and looked relieved when one of their number steered the conversation toward the Pirates’ winning streak.

“There you are, Isaac.”

Joseph Van Dorn enveloped Bell’s big hand in a manicured ham-size paw and shook it firmly. He was tall, broad in the chest, broader in the belly, and light on his feet, a balding man in his forties who might have passed for a sea captain who had prospered in the China Trade or a blacksmith who had invented a tool that made him rich. He appeared convivial, with a ready smile that could brighten his hooded eyes. Red burnsides cascading to an even redder beard gave the impression of a man more hail-fellow-well-met than the scourge of the underworld, and many a confined criminal was still wondering how he got confused.