As the term at the Technical College was over, both boys had full time to devote to their work. All day they labored with paint brush and wrench, testing and finishing. They gave themselves little time for lunch, eating with one hand and working with the other. So engrossed were they on their tasks that they did not notice that the brightness of the day outside was being dimmed rapidly. A spring storm was rolling up from seaward.

Neither did they know that their work was going forward with attention other than their own concentrated upon it. The unseen observer had alighted from a car at its terminal some miles away and tramped across the sand dunes toward the big shed. Keeping warily out of sight he made his way up to the structure and, boring a hole in the planking, watched with burning interest all that was going on within. He was an odd-looking figure, dressed in a loud checked suit and sporting a gaudy necktie and a hat cocked to one side. But his youthful face bore an inquiring, good-humored expression that belied his aggressive way of dressing. Over one shoulder was slung a camera. As he watched the boys through the small hole he had bored with a gimlet that he carried in his pocket, the unseen observer muttered strangely to himself.

“By the double-jointed hoorah of the Sahara Desert!” he exclaimed from time to time. “Dick, my boy, you’ve struck it! Instead of being fired for incompetency, you’ll be the biggest reporter in Boston to-morrow. You’ve run the Mystery of the Skies to its roost,—by the long-legged Llama of Thibet, you have!”

All day he watched, his joints stiff and aching from holding the one position, but he never budged. It was growing toward dusk before he observed the change in the weather that had come with startling suddenness. The sea, calm before, was now roaring angrily on the beach beyond the dunes. The sky was covered with scurrying clouds. The wind moaned ominously.

The unseen watcher made a grimace.

“In for a wetting and three miles to that car,” he muttered, “but by the crooked cantelope of Cambodia, it’s worth it! Hullo! What’s that?”

From seaward there had come the heavy boom of a gun. About four miles off shore, dangerously close for that coast, there lay a white, yacht-like craft. Clearly she had fired the gun. Now she ran up some sort of signal.

“By the scampering snakes of Senegambia, there’s another story!” gasped the watcher. “I’ll be made a managing editor at least, by the time I get through.”


[CHAPTER II.]
A SIGNAL OF DISTRESS.