With the people on the penthouse terrace safely behind them, Bell pegged another shot at Celere. This one came closer, he guessed by the violent motion of Celere’s head, followed by a steep climbing turn away from Bell. Bell followed. The trick, he realized, was to stay behind and stay inside Celere’s turn so that he could keep firing to drive Celere farther and farther from his target.

Celere went up, Bell followed. Celere went down, Bell followed again, drawing so close that he could see Celere’s face as if they were about to commence a boxing match. Celere ducked down, reaching for something inside the nacelle, and brought up a stubby weapon that Bell recognized as his sawed-off lupa shotgun. Buckshot screeched and pinged through his wing stays.

“You have teeth? So do I.”

Bell fired his swivel gun.

Celere’s hand flew from his control post as if it were red-hot. Bell fired again.

Celere jerked alettoni and rudder, and the machine soared toward San Francisco Bay. Bell followed, thinking to force him down over the water. But Celere turned around and raced back at the Inquirer Building. Bell turned more sharply. The Eagle went exactly where he pointed it, and he was suddenly aware that after four thousand miles across the continent he was getting the hang of flying.

He pulled alongside, leveled his swivel gun at Celere, and let go the wheel to motion that Celere should descend and land before he shot him. Celere whipped up the lupa and blasted back point-blank. Buckshot shrieked again, most of it missing, except for a single slug that struck the breech of the Remington, jamming it.

Isaac Bell drew his Browning and raked Celere’s machine with pistol fire.

The answering bellow of the lupa told him that Celere was not impressed. And now the Italian pressed his advantage of heavier firepower, skillfully reloading and firing repeatedly. Only the short range of the shotgun saved Bell from being hit as Celere lined up again to drop the bomb.

Bell saw him reach for the arming wire that would close the first electric switch.

He wrenched the Eagle onto a collision course. He saw sudden panic on Celere’s face. About to ram into the side of the yellow monoplane, Bell turned at the last second to cross directly in front. Celere whirled the double-barreled lupa, tracking Bell until Bell was so close he could see deep inside its gaping muzzles.

When he could not miss, Marco Celere triggered both barrels.

Isaac Bell saw flame jet from them.