He chose a ferry not for its destination but for the fact that its deckhands were already closing its scissor gate, blocking any more passengers from boarding.

“Not so fast, Chinkboy!” a burly deckhand shouted in his face.

Yamamoto already had ten dollars in his hand. The man’s eyes widened at his good fortune, and he reached for it, shouting, “Step lively, sir. Step lively.”

Yamamoto slid past him and moved deeper into the boat, heading for the stairs to the upper deck at a rapid clip.

The whistle blew a sharp tenor note. The deck stopped shuddering as the screws holding her in place stopped turning. Then the enormous boat shook from stem to stern as the screws reversed to drive her out of her slip.

Yamamoto reached the ornamentally carved wooden staircase that swept upward in a graceful curve. For the first time, he looked back, a quick glance over his shoulder. He saw Isaac Bell running full speed to the edge of the slip. At the edge, the detective launched himself in the air in an attempt to broad-jump the rapidly widening gap. The Japanese spy waited to confirm that Bell had fallen in the churning water.

Isaac Bell landed gracefully as a gull, strode to the scissor gate, and engaged the deckhands in conversation.

Yamamoto ran up the stairs. He showed his train ticket to enter the first-class gentleman’s lounge, headed for the men’s room, entered a stall, and closed the door. He turned his tan coat inside out, revealing its black lining. His hatband was formed by multiple layers of tightly wound silk. He unwound it into a long scarf, bent the brims of his Panama downward, and tied it on his head with the scarf. The final touch was packed in his valise. Then all he had to do was wait when the ferry docked until all the men had left the first-class cabin. He had just opened his valise when beneath his feet the rumble of the screws abruptly stopped.

Forward momentum slowed so quickly, he had to brace against the wall. The whistle gave three short blasts. The screws rumbled anew, shaking the deck. And to Yamamoto’s horror and disbelief, the giant ferry backed out of the river and into the terminal slip from which it had just emerged.

THE LOUDEST OF THE HUNDREDS of the Pennsylvania Railroad ferry passengers inconvenienced was a United States senator. He roared like an angry lion at the ferry captain, “What in blue blazes is going on here? I’ve been traveling all day from Washington and I’m late for a meeting in New York.”