The youth stepped across the low sill of the station, hands still upraised. Jack motioned to Frank to search him, and the latter ran his hands over the other’s form, abstracting a revolver and a long knife.

“That all?”

“Yes, sir.”

Bob spun the young Chinaman around, pulled out his belt and tied his hands together with it.

“Keep an eye on him,” said Jack. “I’m going to have a look at the station.”

First casting the rays of his flashlight over the interior and verifying the Chinaman’s statement that he was alone, Jack went inside. Presently Bob and Frank heard him exclaim, and then he appeared in the doorway lugging a heavy square wooden box.

“Look what I found,” he cried delightedly. “A portable radio outfit for field work. This is the very latest equipment. I’ve examined it hastily, and it seems to have everything—antennae coiled up and ready for stringing, some jointed steel poles to attach it to the box and powerful storage batteries.”

“What’ll we do with it?” asked Bob.

“I don’t know yet, but I have a hunch it will come in handy. Well, now I guess we better go down to the boat and tell this man Robbins what we have discovered and what we suspect. Then we can talk to our prisoner, too.”

The latter’s face was impassive. In appearance and judging by the choice of words he had employed, he was an educated youth. Perhaps something could be gotten out of him by questioning. It was worth trying.