He was wondering where Dorothy Langner got the money to buy her father a piano when Bell remembered that she had given it to him only recently.

Scully got uncharacteristically talkative. “You know, Isaac,” he said, gesturing toward the farmhouse below and the two automobiles, “for jobs like this wouldn’t it be nice if somebody invented a machine gun light enough to tote around with you?”

“A ‘sub’ machine gun?”

“Exactly. A submachine gun. But how would you lug all that water to cool the barrel?”

“You wouldn’t have to if it fired pistol ammunition.”

Scully nodded thoughtfully. “A drum magazine would keep it compact.”

“Shall we start the show?” Bell asked, hefting the Sharps. Both detectives glanced at the woods near the house where the Frye Boys would run when Bell disabled their autos.

“Let me flank ’em first,” said Scully. Putting words to action, he waddled down the hill, looking, Bell thought, like a bricklayer hurrying to work. He waved when he was in place.

Bell braced his elbows on the crest, thumbed the hammer to full cock, and sighted the Sharps on the Marmon’s motor cowling. He gently squeezed the trigger. The heavy slug rocked the Marmon on its tires. The rifle’s report echoed like artillery, and a cloud of black smoke spewed from the muzzle and tumbled down the hill. Bell reloaded and fired again. Again the Marmon jumped, and a front tire went flat. He turned his attention to the police car.

Wide-eyed constables boiled out of the house waving pistols. The bank robbers stayed inside. Rifle barrels poked from the window. A hail of lever-action Winchester fire stormed at the black-powder smoke billowing from Isaac Bell’s Sharps.

Bell ignored the lead howling past his head, methodically reloaded the single-shot Sharps, and shot the Ford’s motor cowling. Steam spurted from the hot radiator. Now their quarry was on foot.

All three bank robbers darted from the house, rifles blazing.

Bell reloaded and fired, reloaded and fired. A long gun went flying, and the man staggered, clutching his arm. Another turned and ran toward the woods. Rapid fire bellowed from Scully’s twelve-gauge autoload and caused him to change his mind. He skidded to a stop, looked around frantically, and flung his weapon down and threw his hands in the air. The constables, gripping pistols, froze. Bell stood up, aiming the Sharps through the black smoke. Scully sauntered from the woods, pointing his shotgun.

“Mine’s a twelve-gauge autoload,” Scully called conversationally. “Fellow up the hill’s got a Sharps rifle. About time you boys got smart.”

The constables dropped their pistols. The third Frye boy levered a fresh cartridge into his Winchester’s chamber and took deliberate aim. Bell found him in his sights, but Scully fired first, tipping the barrel of his shotgun high to increase the range. The slugs spread wide at that distance. Most tore past the bank robber. Two that did not peppered his shoulder.

NEITHER SHOT MAN WAS mortally wounded. Bell made sure that they would not bleed to death and handcuffed them with the others in Scully’s milk truck. They started downhill, Scully driving the truck, Bell in his Locomobile bringing up the rear. Just as they reached the Cranbury Turnpike, Mike and Eddie, the Van Dorns assigned to help Scully, appeared in an Oldsmobile, and the caravan headed for Trenton to turn the bank robbers and the crooked cops over to the State’s Attorney.

Two hours later, nearing Trenton, Bell saw a road sign that jogged his photographic memory. The sign was a stack of town and road names lettered on white arrows that pointed south: the Hamilton Turnpike, the Bordentown Road, the Burlington Pike, and the West-field Turnpike to Camden.

Arthur Langner had written appointments on a wall calendar. Two days before he died he had met with Alasdair MacDonald, the turbine-propulsion specialist who had been contracted by the Navy’s Steam Engineering Bureau. MacDonald’s factory was in Camden.

Her father loved his guns, Dorothy Langner had pleaded. As Farley Kent loved his hulls. And Alasdair MacDonald his turbines. A wizard, she had called MacDonald, meaning he was her father’s equal. Bell wondered what else the two men had in common.

He squeezed the Locomobile’s horn bulb. The Oldsmobile and milk truck skidded to a dusty halt. “There’s a fellow I ought to see in Camden,” Bell told Scully.

“Need a hand?”

“Yes! Soon as you turn this bunch in, could you get to the Brooklyn Navy Yard? There’s a naval architect in the drawing loft named Farley Kent. See if he’s on the up-and-up.”

Bell turned the Locomobile south.

“ON CAMDEN’S SUPPLIES, THE WORLD RELIES,”

a billboard greeted Isaac Bell as he entered the industrial city, which occupied the eastern shore of the Delaware River across from Philadelphia. He passed factories that made everything from cigars to patent drugs to linoleum and terra-cotta and soup. But it was the shipyard that dominated. The incongruously named New York Shipbuilding Company lined the Delaware and Newton Creek with modern covered ways and gigantic gantries thrusting at the smoky sky. Across the river sprawled Cramp Ship Builders and the Philadelphia Navy Yard.

Evening was falling before Bell found the MacDonald Marine Steam Turbine Company inland from the riverfront in a warren of smaller factories that supplied the shipyard with specialty items. He parked the Locomobile at the gates and asked to see Alasdair MacDonald. MacDonald was not in. A friendly clerk said, “You’ll find the Professor down in Gloucester City-just a few blocks from here.”

“Why do you call him the Professor?”

“Because he’s so smart. He was apprenticed to the inventor of the naval turbine, Charles Parsons, who revolutionized high-speed ship propulsion. By the time the Professor emigrated to America, he knew more about turbines than Parsons himself.”

“Where in Gloucester City?”

“Del Rossi’s Dance Hall-not that he’s dancing. It’s more saloon than dance hall, if you know what I mean.”

“I’ve encountered similar establishments out west,” Bell said drily.

“Cut over to King Street. Can’t miss it.”

Gloucester City was just down the river from Camden, the two cities blending seamlessly. King Street was near the water. Saloons, quick-and-dirties, and boardinghouses hosted workingmen from the shipyards and the bustling river port. Del Rossi’s was as unmissable as MacDonald’s clerk had promised, boasting a false front mocked up to look like a proscenium arch in a Broadway theater.

Inside was bedlam, with the loudest piano Bell had ever heard, women shrieking with laughter, perspiring bartenders knocking the necks off bottles to pour faster, exhausted bouncers, and wall-to-wall sailors and shipyard hands-five hundred men at least-determined to win the race to get drunk. Bell studied the room over a sea of flushed faces under clouds of blue smoke. The only occupants of the saloon not in shirtsleeves were himself, in his white suit, a handsome silver-haired gent in a red frock coat whom he guessed was the proprietor, and a trio of dandified gangsters tricked out in brown derbies, purple shirts, bright waistcoats, and striped ties. Bell couldn’t see their shoes but suspected they were yellow.

He plowed through broad shoulders toward the frock coat.

“Mr. Del Rossi!” he shouted over the din, extending his hand.

“Good evening, sir. Call me Angelo.”

“Isaac.”

They shook hands. Del Rossi’s were soft but bore the long-healed burns and cuts of ship work in his youth.

“Busy night.”

“God bless our ‘New Navy.’ It’s like this every night. New York Ship launches the Michigan next month and just laid the keel for a twenty-eight-knot destroyer. Across the river, the Philadelphia Navy Yard is building a new dry dock, Cramp launches South Carolina come summer, plus they’ve already nailed a contract for six 700-ton destroyers-six, count ’em, six. What can I do for you, sir?”