Bell wrenched himself loose and ran to the head of the car and through the vestibules into the next car. At the far end, flame from the spirit stove for brewing tea in that car’s porter’s closet illuminated a broad-shouldered, long-armed silhouette running past. That porter, too, lay on the floor, either out cold or dead. The tall detective raised his gun and did not waste time ordering the Acrobat to stop.

Bell aimed for his legs and squeezed the trigger.

Just as the weapon’s firing pin descended on the rim of the cartridge, detonating the charge within, Isaac Bell jerked the gun upward with all his might. A woman in a dressing gown that glowed white in the starlight had stepped out of her stateroom. She screamed and Bell saw her sleeping cap fly from her head.

“Are you all right?” an aghast Isaac Bell cried. This was his nightmare: an innocent had stepped into his line of fire. He ran to her, feeling his way along the row of stateroom doors. Then he felt a stinging sensation in his hand—wooden splinters his bullet had gouged from her door—and he realized with enormous relief that no woman shot in the head could keep screaming that loudly. He confirmed that she was unhurt, guided her gently back to her berth, then charged after the Acrobat.

UNLIKE ISAAC BELL, THE GERMAN was not slowed by confused and frightened passengers blundering out of their staterooms yelling for porters and demanding explanations. He smashed through them, knocking bodies to the floor and shattering glass as he pushed others through the windows. The derailment had extinguished the lights, so no one could see him—although at the moment his own wife would not recognize his face, so contorted was it by rage. Twice now Isaac Bell had upended an intricately planned and precisely executed operation.

He ran toward the head of the train, and when he reached the mail car whose couplers had parted, he jumped to the ballast and ran past the express cars and the tender. He heard Isaac Bell pound after him. Seizing a golden opportunity to put a stop to Bell’s interference once and for all, the German climbed the side of the helper locomotive.

Out of nowhere, a brakeman grabbed his ankle.

The German laid him flat with a kick so powerful the man’s neck broke. But the impact caused him to lose his own balance. He started to fall backwards. Reacting coolly, with a cat’s economy of motion, he flipped his left hand forward. Launched from the gauntlet buckled to his wrist, the weighted end of the wire he had used to strangle the express messenger whirled around a handrail.

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