Isle of the Undead by Lloyd Arthur Eshbach description:
A gripping, thrilling, uncanny tale about the frightful fate that befell a yachting party on the dreadful island of living dead men.
he stared, he shivered; and it was not because of the cold draft drawing through the fissure, fanning his brine-drenched body.
Grim and starkly forbidding the plain lay before him, dead as the frozen landscape of the moon. Once there had been life there, but now only the skeletons of trees remained, lifting their wasted limbs in rigid pleading to an unresponsive sky. Some, there were, that had fallen, uprooted by the fury of passing hurricanes; these lay like the scattered bones of a dismembered giant, age-blackened, and painted with hoarfrost by the brushes of moonlight. Feebly the dead forest stirred under the touch of a moaning wind, and the gaunt shadows cast by the trees seemed to be multi-armed monsters slithering over the rocky earth.
He looked beyond the trees, and he saw light. Little squares of pale radiance cut high in the walls of an ancient black castle. Castle? Cliff frowned. He could liken it to nothing else, though he could not recall ever having seen a castle which thrust curvi