me and kept me in prison for a long time."

"Oh, they would have done that, Dick, of course. That was the idea. And
it's very easy for them to manage such things here. As easy as it used
to be in France before the revolution there."

"What are we going to do now, Steve?"

Dick looked down at the helpless figures of the two men on the floor.
Neither of the scouts had paid much attention to them as yet, but now
they leaned down and examined them.

"They're not badly hurt," said Steve, contemptuously. "They saw the
crate falling and so did I. And they tried to jump. So it didn't fall
full on top of them, but struck glancing blows on their heads and almost
pushed them out of the way. I don't see how you ever got it going at
all, all by yourself! It looks terribly heavy."

"I think it was because it wasn't very well balanced, Steve. If it had
been turned the other way probably I couldn't have budged it. But the
heavy end was on top, which made it go over. I sort of jumped at it, and
that gave it the start."

"I'm afraid we'll have to leave them here," said Steve. "I wish there
was some way for us to take them along, but I don't see how we can. We
might be able to drag Hallo with us, but we wouldn't get very far."

"I suppose not. He has lots of friends, hasn't he? I saw ever so many
people stop and speak to him when I was following him on the way here."

"I don't think he's got many friends, but there are a lot of people who
know him, all right. Still, it isn't that--it would be making ourselves
conspicuous by having him with us at all."

"It would be a good thing to take him, though, if we could, wouldn't
it?"

"Oh, yes. The best thing in the world! If we could only get him to our
boat and carry him back to Belgrade!"

"Steve, how about the men who are working in the tunnel under the
arsenal?"

"What do you mean? What do you know about the tunnel under the arsenal?"

Steve was startled and dismayed, but Dick laughed at him.

"That's all I know," he said. "Just that there is such a thing, Steve.
You needn't be frightened--I haven't been spying around. But this man
that came here to see Mike Hallo knew all about it. He told him the mine
was going to be sprung to-night, and that they must hasten to stop it."

"That ends the last doubt! He is a traitor!" said Steve. "He surely will
have to pay the price of treachery, too, when there is an opportunity."

"Do you mean that they will kill him?"

"What else can