Harry Shaw performs this classic science fiction from master writer Murray Leinster. Something lurks in the depths of the Luzon Deep off the Philippine Islands. Something unearthly. Perhaps sinister. Entire ships disappear. Schools of fish go mad. Denizens of the deep come to the surface, perhaps on a mission. But from what? And why? Radar expert Terry Holt and the crew of the Esperance seek answers to these questions, and perhaps don’t want to the know the truth.