Bell paced the area, his eyes roaming. Assume, he thought, that the Akrobat was a real acrobat. Assume he was a trained circus tumbler or trapeze artist. Assume he was extraordinarily strong, astonishingly agile, with no fear of heights and nerves of steel.

Bell smiled, suddenly gripped by a fond memory. He had run away from home to join the circus when he was a boy. Before his father caught up with him in a Mississippi fairground, he had befriended animal tamers, clowns, horseback performers, and especially the acrobats, whom he revered for their bravery and their strength.

Assume this Akrobat possessed every power of a professional big top performer who had honed his skills since childhood, as circus stars did. Surely, from what Bell had seen the night they sailed, the man was indeed strong and agile, with no fear of heights and nerves of steel. Was it possible for such a man to jump off the boat deck, drop ten feet down the sheer side of the ship, and swing back aboard on the promenade deck?

The answer was no.

Bell leaned over the railing and looked straight down at the water. Then he looked up the side of the Marconi house. As he had told Archie, the nearest lifeboat hanging from davits beside the boat deck was thirty feet from where the Acrobat jumped the railing. A quick count of boats revealed something he had never really thought about before. They had room for only five hundred people, while Mauretania carried three thousand…

Suddenly Isaac Bell bolted to the nearest companionway and bounded up the stairs. Would he have noticed in the dark if the Acrobat had jumped up rather than down? Up to one of the many stays and cables rising to the sundeck, immediately above the boat deck, where the Marconi house sat. Would he have seen him grip a line and scramble up to the sundeck?

Bell ran along the boat deck past the library windows that had backlighted the scene that night and saw immediately that the answer was no. There were no stays remotely near enough for a man to jump to. Therefore, if the Acrobat hadn’t fallen into the sea, he had to have landed on the deck below the boat deck. Also impossible. Baffled, Isaac Bell wandered slowly back down to the promenade deck.

Two seamen were smoothing the wood railing with rasps and sandpaper.

“Good morning, sir.”

“Good morning, gents. Up early?”

“Soon as we can see to work,” said one.

The other said, “If we let wear and tear go, the ship would be a bloomin’ embarrassment. Look at this gouge! Fairly tore the rail in half.” He stepped back to show Bell their repair of what was actually the minutest gouge in the teak, which only an eagle-eyed bosun would notice.

Oddly, the gouge traced the full twelve-inch curve of the wood from inboard to outboard as if something flexible had wrapped around it. “What do you suppose caused that?” Bell asked.