In the deep, crushing black of the abyss, a 17th-century relic known only as the Clockwork Heart is playing music.
For deep-sea explorer Silas Kael, the mechanical, rhythmic pulse—the Sunken Symphony—is the siren call of a lifetime, the validation of a family legend. His obsession leads him to the wreck of the privateer Aeolian, where the pressure alone should have crushed any hope of survival.
But Silas is not alone in the dark. Above him lurks the predatory collector Baron Volkov, who treats the ocean floor as his personal black market. Volkov wants the relic and has unleashed military-grade acoustic weapons to acquire it.
