"Who are you? What you doing here?" he demanded sternly.
The next moment, and before Rob could reply, the fellow noted the Boy Scout uniform.
"Oh, ho!" he exclaimed in a malignant tone. "So you are one of dose Boy Scouts, eh? You think you pretty smart, eh? You vait. I may make you pay for your fun."
There was a cold sort of malice in the man's way of speaking that actually sent a chill down Rob's spine.
But he plucked up courage to make a bold reply.
"I know the sort of illegal trafficking you are engaged in, Berghoff," he said boldly, "and I tell you, you had better leave me alone."
"Is dot so?" sneered the fellow. "You haven't seen the last of me for a long time yet."
"My friends will punish you for this," exclaimed Rob, in as confident a tone as he could assume.
"It vill be a long time alretty before you see your friendts again," jeered the other. "Ah, here comes Mike and Gyp, now. Now ve findt out what you vos doing up by der hut."
As the spy had said, the two men who had been in the hut came up at the moment.