The mainland gave Dr. Elias Voss six months to live. Acheron Biologics offered him something better — and the sea paid the price.
Two hundred miles into the North Atlantic, Station Black Coral was built to drill for dead things. Instead, its dying lead researcher nurtured a living one: an engineered organism designed to repair the human body — until it learned to repair itself, and everything else it touched.
Now the rig hums with something deeper than generators. The crew is gone. The logs of Dr. Voss describe a transformation that was never supposed to leave the water.
Leah Maro has seen what the organism can do to a coastline. Sergeant Elias Hale has spent a lifetime expecting the ground beneath him to turn hostile. Together with a handful of survivors, investigators, and unwilling cleanup crews, they are drawn back to Black Coral — toward the architect of the disaster, the truth buried in Voss's final logs, and a choice that will decide whether the Abyssal Protocol dies with the rig or drifts out to sea.
Some science forgets its humanity. The sea remembers.