Now he knew why Celere had stolen the ice tongs. He had forgotten that whatever his failings, Celere was a darned clever machinist. There would be nothing cumbersome about dropping the dynamite, no clumsy hoisting it over the side of the machine.

All four boxes of dynamite were dangling below the monoplane, directly under Celere, where the two hundred pounds would be well balanced, and they were hanging from the ice tongs. Bell saw a rope running from the ice-tong handle up the side of the aeroplane into the steering nacelle where Celere sat.

To drop the dynamite, all he had to do was arm the electric detonator switch and tug the rope.

Bell dropped his glasses and took aim with the Remington auto rifle. The range was still too great. But now Celere was crossing the forest of sailing masts that marked the waterfront. He was mere minutes from Whiteway’s Market Street headquarters. Bell steepened his dive and picked up a little more speed. It made the difference: now he, too, was crossing the waterfront, and Celere was in rifle range. But he was flying above Bell now because the dive had taken him so low, he was nearly scraping building tops.

Ahead was the Inquirer Building, taller than all around it, with the yellow race banner on top. Bell tweaked his elevator, rose slightly, and found Celere’s machine in his rifle sight. Just as Bell was about to pull the trigger, he saw something glitter on the outdoor terrace of Whiteway’s penthouse office. Bell whipped his field glasses to his eyes.

Immediately ahead of Celere’s dynamite-laden monoplane, smack in his line of fire, operators where cranking moving-picture cameras. Directing them was a tall blond woman in a white shirtwaist with her hair swept up so she could inspect what they saw through their lenses. Marion had chosen to shoot the finish from the dramatic setting of the roof where the aviators would circle before landing at the Presidio.

Bell banked hard right to change his field of fire. Celere was flying straight at the building. He was less than one hundred feet higher, and closing fast, when Bell saw him reach for the rope.

Bell had no clear shot at Celere without endangering Marion.

But if he didn’t shoot, Celere would drop his bomb.

Bell whipped his machine hard left. The wings rattled, and the stays groaned. The motor screamed as the propeller hacked the shifting air. He soared away from Celere’s course to shift the angle so he could fire. The range increased radically. He had one second to fire. The gun kicked. Marco Celere ducked his head and looked around wildly, eyes locking in astonishment on Bell’s Eagle racing back at him.

He grabbed the bomb-release rope. But he was too late. His flying machine had flown past the Inquirer Building. He banked to swing back and make another run.

“Not on my watch,” said Isaac Bell.