some hollow, lying there hidden, and as of course was out of the focus of the searchlight.
"Come on, Koku, we'll find him!" exclaimed Tom, and together they made a search, Mr. Damon joining them, while Ned worked the lantern. But it was of no avail, for they did not find the stranger.
"Well, we might as well go back," said Tom, at length. "We can't find him. He's probably far enough off by this time."
"Who was he?" panted Mr. Damon, as he walked beside Tom and Koku to the airship. Ned had switched off the big light on a signal from the young inventor.
"I don't know!" answered Tom.
"But what did he want? What was he doing? I don't quite understand."
"He wanted to put my searchlight out of commission," responded our hero. "From that I should argue that he was either one of the smugglers, or trying to aid them."
And this theory was borne out by Mr. Whitford, who, on calling the next morning, was told of the occurrence of the night. Koku related how he had found it uncomfortable in his bunk, and had gone out on deck for air. There, half dozing, he heard a stealthy step. At once he was on the alert. He saw a man with a gun creeping
