The crystal flashed once, a deep violet. The chronometer on his chest shattered. The cave began to tremble. The sea roared back in.

The world inverted.

But for Manuel "Mano" Vázquez, the score had always been different. He was a ghost himself—a lean, weather-torn man of sixty with eyes the color of a stormy sky. He lived alone in a stone palloza above the treacherous inlet known as the Boca do Inferno (Hell's Mouth). And he was the last man alive who knew the secret of the Galician Gotta 235 .

At the exact moment the chronometer’s second hand swept past the runic symbol etched at the 12 o’clock position, the sea did something impossible. It parted . Not like the Red Sea, but a swirling, localized vortex, a staircase of roaring foam leading down into a phosphorescent darkness. Mano did not hesitate. He swung over the side, the heavy boots clanking on slick, ancient rock, and descended.

The sea off the coast of Galicia does not give up its dead easily. It is a cold, grey, Celtic sea, full of whispered legends and the sharp scent of iodine and granite. For the Percebeiros , the goose-neck barnacle harvesters of the Costa da Morte, this is a simple fact of life. They know the score: one wrong step on the slick, vertical rocks, and the Atlantic swallows you whole, adding your bones to the shipwrecks below.

The air in the cave was breathable, but foul—a graveyard smell of ozone, rust, and dried brine. His helmet lamp cut a weak beam through the gloom. He saw the U-235.