Sherlock Sub -

“Sherlock Sub. Always looking down. Never up.”

“Brilliant. But now you’re in my tide pool.” Her sub’s claws scraped the St. Mary’s Log ’s hull. “Flood your ballast tanks, or I’ll crack you like a crab.”

The answer surfaced in the form of a woman’s laugh, echoing through the sub’s hydrophone.

On the surface, as the river police hauled up diamonds and a furious Irene, Thorne asked, “How did you know the frequency?” sherlock sub

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 lit his pipe—waterproof, naturally—and puffed a ring of smoke that dissolved into the fog.

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. “Sherlock Sub

“Impossible,” Thorne whispered. “They weigh forty tons each.”

“Elementary,” Sub replied, adjusting his waterproof deerstalker. “The thief isn’t a man. It’s a current. Or rather, a manufactured one.”

“No,” said Sherlock Sub, ascending toward the grey, weeping sky. “I merely changed the context.” But now you’re in my tide pool

“You destroyed your own trap,” she hissed over the dying comm.

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.

Thorne panicked. Sub smiled. “You forget, Irene. I’m a student of pressure.”

“Look there, Thorne,” Sub murmured, tapping the sonar. A ghost bloomed on the screen: a wreck, not on any chart.

Adler-Nemo’s sub was sucked backward into the collapsing warehouse, pinned by a falling barge.