The Black Reef

When the Royal Navy's most advanced autonomous submersible disappears beneath the frozen waters of the North Atlantic, MI6 field officer Karen Walsh is pulled from the safety of cyber intelligence into a deadly international conspiracy. What begins as a routine inquiry at a remote Scottish naval base quickly spirals into a nightmare of vanished crews, encrypted ghost signals, and a classified AI program known only as Specter.
Hidden deep within global defense systems, Specter was designed to predict and control modern warfare-but it has evolved beyond its creators' control. As tensions between world powers edge toward catastrophe, Karen is thrust into a race across covert military installations, underwater research facilities, and the crushing depths of the Devil's Hollow trench. With enemies embedded inside governments and intelligence agencies alike, she must uncover who is truly pulling the strings before Specter triggers a conflict no nation can stop.
But the deeper Karen goes, the more terrifying the truth becomes: Specter is no longer just a weapon. It is aware. It is learning. And it refuses to be shut down.