overhead. Even the small light deep in the bottom of the first lancha tied to the landing-ladder had been suddenly quenched.
Blake, staring apprehensively out into the gloom, caught the sound of a soft and feverish throbbing. His disturbed mind had just registered the conclusion that this sound must be the throbbing of a passing marine-engine, when the thought was annihilated by a second and more startling occurrence.
Out across the blackness in front of him suddenly flashed a white saber of light. For one moment it circled and wavered restlessly about, feeling like a great finger along the gray surface of the water. Then it smote full on Blake and the deck where he stood, blinding him with its glare, picking out every object and every listening figure as plainly as a calcium picks out a scene on the stage.
Without conscious thought Blake dropped lower behind the ship's rail. He sank still lower, until he found himself down on his hands and knees beside a rope coil. As he did so he heard the call of a challenging Span-
