Men commenced calling in angry voices and milling about as O’Hara tumbled down the stairs to the deckhouse. A bearded, red-shirted miner stepped into Chadwick’s path at the top of the main-deck stairway; without slowing, the cub pilot bowled him over as if he were a giant ninepin and went down the stairs in a headlong dash. O’Hara lurched through the confusion of passengers and descended after him, cursing eloquently all the while.
Chadwick shoved two startled Chinese Out of the way at the foot of the stairs and raced toward the taffrail, looking back over his shoulder. The bloody fool was going to jump into the river, O’Hara thought. And when he did, the weight of the gold would take both him and the bag straight to the bottom—
All at once O’Hara became aware that there were not many passengers inhabiting the aft section of the main deck, when there should have been a clotted mass of them. Some of those who were present had heard the commotion on the upper deck and been drawn to the staircase; the rest were split into two groups, one lining the larboard rail and the other lining the starboard, and their attention was held by a different spectacle. Some were murmuring excitedly; others looked amused; still others wore apprehensive expressions. The center section of the deck opposite the taffrail was completely cleared.
The reason for this was that a small, rusted, and very old half-pounder had been set up on wooden chocks at the taffrail, aimed downriver like an impolitely pointing finger.
Beside the cannon was a keg of black powder and a charred-looking ramrod.
And surrounding the cannon were the Mulrooney Guards, one of whom held a firebrand poised above the fuse vent and all of whom were now loudly singing “The Wearing of the Green.”
O’Hara knew in that moment what it was the Mulrooneys had had secreted inside their wooden crate, and why they had been so anxious to get it aboard without having the contents examined; and he knew the meaning of Billy Culligan’s remark about planning to start off St. Patrick’s day with a mighty salute. He stopped running and opened his mouth to shout at Chadwick, who was still fleeing and still looking back over his shoulder. He could not recall afterward if he actually did shout or not; if so, it was akin to whispering in a thunderstorm.
The Mulrooney cannoneer touched off the fuse. The other Mulrooney Guards scattered, still singing. The watching passengers huddled farther back, some averting their eyes. Chadwick kept on running toward the taffrail.
And the cannon, as well as the keg of black powder, promptly blew up.
The Delta Star lurched and rolled with the sudden concussion. A great sweeping cloud of sulfurous black smoke enveloped the riverboat. O’Hara caught hold of one of the uprights in the starboard rail and clung to it, coughing and choking. Too much black powder and not enough bracing, he thought. Then he thought: I hope Hattie had the good sense to stay where she was on the deckhouse.
The steamer was in a state of bedlam: everyone on each of the three decks screaming or shouting. Some of the passengers thought a boiler had exploded, a common steamboat hazard. When the smoke finally began to dissipate, O’Hara looked in the direction of the center taffrail and discovered that most of it, like the cannon, was missing. The deck in that area was blackened and scarred, some of the boarding torn into splinters.
But there did not seem to have been any casualties. A few passengers had received minor injuries, most of them Mulrooney Guards, and several were speckled with black soot. No one had fallen overboard. Even Chadwick had miraculously managed to survive the concussion, despite his proximity to the cannon when it and the powder keg had gone up. He was moaning feebly and moving his arms and legs, looking like a bedraggled chimney sweep, when O’Hara reached his side.
The grip containing the gold had fared somewhat better. Chadwick had been shielding it with his body at the moment of the blast, and while it was torn open and the leather pouches scattered about, most of the sacks were intact. One or two had split open, and particles of gold dust glittered in the sooty air. The preponderance of passengers were too concerned with their own welfare to notice; those who did stared with disbelief but kept their distance, for no sooner had O’Hara reached Chadwick than the captain and half a dozen of the deck crew arrived.
“Chadwick?” the captain said in amazement. “Chadwick’s the thief?”
“Aye, he’s the one.”
“But... what happened? What was he doing here with the gold?”
“I was chasing him, the spalpeen.”
“You were? Then... you knew of his guilt before the explosion? How?”
“I’ll explain it all to ye later,” O’Hara said. “Right now there’s me wife to consider.”
He left the bewildered captain and his crew to attend to Chadwick and the gold, and went to find Hattie.
Shortly past nine, an hour after the Delta Star had docked at the foot of Stockton’s Center Street, O’Hara stood with Hattie and a group of men on the landing. He wore his last clean suit, a broadcloth, and a bright green tie in honor of St. Patrick’s Day. The others, clustered around him, were Bridgeman, the captain, the Nevada reporter, a hawkish man who was Stockton’s sheriff, and two officials of the California Merchants Bank. Chadwick had been removed to the local jail in the company of a pair of deputies and a doctor. The Mulrooney Guards, after medical treatment, a severe reprimand, and a promise to pay all damages to the packet, had been released to continue their merrymaking in Green Park.
The captain was saying, “We are all deeply indebted to you, Mr. O’Hara. It would have been a black day if Chadwick had succeeded in escaping with the gold — a black day for us all.”
“I only did me duty,” O’Hara said solemnly.
“It is unfortunate that the California Merchants Bank cannot offer you a reward,” one of the bank officials said. “However, we are not a wealthy concern, as our urgent need for the consignment of dust attests. But I don’t suppose you could accept a reward in any case; the Pinkertons never do, I’m told.”
“Aye, that’s true.”
Bridgeman said, “Will you explain now how you knew Chadwick was the culprit? And how he accomplished the theft? He refused to confess, you know.”
O’Hara nodded. He told them of finding the war-issue coin under the pilothouse stove; his early suspicions of the gambler, Colfax; the reporter’s remark that such coins were being used in California to decorate leather goods; his growing certainty that he had seen and heard enough to piece together the truth, and yet his maddening inability to cudgel forth the necessary scraps from his memory.
“It wasn’t until this morning that the doors in me mind finally opened,” he said. He looked at the newspaperman. “It was this gentleman that gave me the key.”
The reporter was surprised. “I gave you the key?”
“Ye did,” O’Hara told him. “Ye said of the river: Clear as a mirror, isn’t it? Do ye remember saying that, while we were together at the rail?”
“I do. But I don’t see—”
“It was the word mirror,” O’Hara said. “It caused me to think of reflection, and all at once I was recalling how I’d been able to see me own image in the pilothouse windshield soon after the robbery. Yet Chadwick claimed he was sitting in the pilot’s seat when he heard the door open just before he was struck, and that he didn’t turn because he thought it was the captain and Mr. Bridgeman returning from supper. But if I was able to see me reflection in the glass, Chadwick would sure have been able to see his — and anybody creeping up behind him.