None were disappointed.

The bride was bewitchingly beautiful in a daring, close-fitting cream-colored dress with a high waistline that suited her erect carriage and a sash of diaphanous silk that promised, discreetly, an enchanting décolletage. Her blond hair was swept up high on her head, circled by an abbreviated veil that graced her high brow, and capped with a tiara made of rosebuds instead of diamonds. Diamonds, all agreed, would have paled beside her dazzling eyes.

Her golden-haired groom stood proudly at her side in a tailcoat. He was tall and straight-backed as a cavalry officer. Beneath his gold mustache, his lips parted in a smile that twitched repeatedly into a broad grin.

The beautiful matron of honor and handsome best man wore expressions of sheer delight for their friends. The Mauretania’s famously standoffish captain was a vision of cordiality, aglitter in the dress uniform of the Royal Naval Reserve, with buttons, belt, braid, and epaulets of gold, a sword at his side, and a hat cocked fore and aft on his head.

“We are gathered together in the sight of God and in the face of Mauretania’s passengers and ship’s company to join this man and this woman in matrimony, which is an honorable estate…”

WITH THE ATTENTION OF THE ENTIRE ship riveted by the wedding, Professor Beiderbecke calculated it would be safe to visit the baggage hold, deep below and far to the back, to check on the well-being of his machines and instruments. He retreated before the ceremony began, pleading that his seasickness was worse, even though the sea had calmed and most passengers were moving about with color restored to their faces.

Clyde had barely noticed. The young man was in a high state of excitement, put there initially by gaining entrance to the sumptuous First Class lounge, then by being seated next to an exotic Russian woman of Marion’s acquaintance. Dark-eyed Mademoiselle Viorets was no exception to Beiderbecke’s experience that Russian women were intoxicating. Poor Clyde was panting like a Austrian Brandlbracke puppy.

Fearing that the way into the bowels of the gigantic ship would be a confusing labyrinth of stairs and passageways, the Professor had studied builders’ drawings in the library and committed them to memory just as he would schematics for arcane electrical circuits or the latest triode vacuum tubes.

Rich carpets and runners in the corridors of passenger quarters gave way to plebeian rubber tiling. Wide staircases narrowed into steel-shrouded companionways. He dodged crew when he saw them in time, and directed at those he could not avoid a haughty stare: Make way for Professor Franz Bismark Beiderbecke in his old-fashioned frock coat and silver-headed walking stick.

Suddenly he had a strange feeling that someone was watching him. His first terrible thought was that the Akrobat—as he had dubbed the long-armed, agile thief who had tried twice to steal his Sprechendlichtspieltheater machine—was stalking him again.

Impossible. Beiderbecke had seen with his own eyes the mysterious Akrobat jump off the Mauretania into the sea. Nonetheless, he stopped in his tracks and cast a fearful glance up the stairs. No one. He craned his neck to peer down another flight. No one. He poked his head into a corridor, saw no one, and continued down into a crew section, past rudimentary sleeping quarters and lavatories, storage rooms, and pantries. The air grew oppressive.