“Now, Thorne, the game is still afloat.”
He flipped a switch. A high-frequency pulse screamed from the sub’s speakers—not a weapon, but the precise frequency of the hydraulic pump’s resonance. The drowned warehouse began to tremble. Bricks rained. The pump overloaded, reversing current.
His vessel, the St. Mary’s Log , was a retrofitted salvage submarine, all brass periscopes and humming sonar. His “Watson” was a grumpy marine biologist named Dr. Aris Thorne, who’d rather study bioluminescent algae than chase criminals in the murk.
“Sherlock Sub. Always looking down. Never up.” sherlock sub
Thorne panicked. Sub smiled. “You forget, Irene. I’m a student of pressure.”
The answer surfaced in the form of a woman’s laugh, echoing through the sub’s hydrophone.
The Thames had coughed up a mystery. Three barges had vanished from the Surrey Commercial Docks in as many weeks, leaving only a slick of iridescent oil and a single, sodden velvet glove. Scotland Yard’s river police called it current theft. Sherlock Sub called it a lie. “Now, Thorne, the game is still afloat
On the surface, as the river police hauled up diamonds and a furious Irene, Thorne asked, “How did you know the frequency?”
But who?
“You destroyed your own trap,” she hissed over the dying comm. Bricks rained
In the grey, drizzling chill of a London February, a different kind of detective was on the case. Not Holmes of Baker Street, but Sherlock Sub — the city’s only underwater consulting detective.
He’d noticed the glove’s stitching—a rare waterproof sealant used only in deep-sea industrial fans. And the oil slick wasn’ engine oil; it was a synthetic lubricant for hydraulic thrusters . Someone had built an underwater conveyor—a giant, silent pump—to suck the barges into this lair.