The strange boy vanished before Dick could ask him what he meant, and he went on, wondering. His whole manner had been friendly, but it was also puzzling in the extreme. Instinctively Dick had told him where he was staying in Semlin, and then the other had disappeared at once. Dick could make nothing of it.

"Oh, well, it can't make any difference," he said to himself. "He didn't want to know for Mike Hallo, because Mike must know all about where I'm staying, and if he doesn't, he can find out—in a place where the police get the names of everyone who takes a room for a night."

So Dick resolved not to worry about the future, but to have a look around the town. He didn't think much of Semlin. It might be old, but it was not especially interesting. It seemed to him dirty, for one thing, and he didn't like dirt. Belgrade, across the river Save, however, fascinated him. There was something romantic about the great citadel. He knew that it had withstood siege after siege in the olden times, and the fact that it probably wouldn't be used as a fortress at all if war broke out that day didn't detract a bit from the interest of its history.

"Some fort, all right!" he said to himself. "I can just see those old Johnnies trying to rush that hill, in days when men fought hand to hand, instead of laying off a few miles and pounding away at a place with big guns. If they're going to have another scrap here, I hope I'm around to see some of it. I'd like to see a war."

He was to be gratified in that modest wish!

There was one noticeable thing. Semlin was a garrisoned town; a regiment of the Austrian army was always there. But now a great many extra troops were always more or less in evidence. Trains would come in, with soldiers looking out from every window. The men would detrain, march through the town, and disappear. After leaving Hallo's office, Dick saw a full regiment arrive like that, march through the streets, and disappear to the west. Now he stopped and began doing a sum in mental arithmetic.

"Gee!" he said, to himself. "I bet the consul's right! I bet the Austrians do mean to start something! That makes about fifteen thousand men I've seen brought in here just since I've been here. I wonder if the Servians know about it? I should think it would be a pretty good thing for them to have a few people here in Semlin just sort of keeping their eyes open."

Dick did not know to the full how serious the situation was. But then very few people in Semlin did. Here news was being suppressed. At this point, where the border brought masses of Servians and Hungarians into such close contact, it was not considered wise to allow the newspapers to print all they knew. It was understood that Austria had made certain demands, but it did not seem to occur to anyone in Semlin that it was possible for tiny Servia to defy the mighty Austrian empire. But as a matter of fact, the final steps that led to the great war were being taken, and war was already regarded as inevitable by those who, like Consul Denniston, were in a position to know the truth.

The consul had told him to come back for dinner at six o'clock, and so Dick had a good deal of time to kill. He determined, therefore, to go across to Belgrade and see if there was a message there yet from the Abercrombies, the family with which he had traveled as far as Buda-Pesth. He was to engage rooms for them when they wrote or telegraphed to him that they were ready for him to do so, and he decided that he might as well see if the message had come, though he was pretty sure that there had not been time yet.

To his surprise, he found some difficulty in passing the guards at the centre of the bridge. Luck favored him, however. One of the soldiers was a Hungarian who had been a waiter at a famous Hungarian restaurant in New York, and had returned to serve his term with the army. When he heard Dick say that he was an American, he offered to question him, and began to ask Dick about New York.

"He's all right. He knows all the places I know!" said the soldier, after that.

And so Dick was able to proceed. In Belgrade, inquiring at the bank the Abercrombies had named, he found a message, but not the sort of message he had been looking for.

"We are going to London as fast as we can get there," ran the message. "Should advise you to do the same. Situation looks very serious."

There had been more in the original message, for the blank was plainly marked "Censored." Dick was indignant at the idea that anyone should interfere with a telegram sent by as distinguished an American as Judge Abercrombie, but, after all, he decided there was no one here to blame. The censoring had been done at Buda-Pesth in all probability. And the essential fact was there. He was a good deal disappointed, for he had rather hoped that Judge Abercrombie might be able to help him in his dealings with Mike Hallo. However, there was no help for it.

So, having nothing else to do now, he spent a part of the afternoon in wandering about Belgrade, and making himself familiar with the strange old town. The older part of the city he found to be much more romantic when viewed from Semlin. At close quarters it was incredibly dirty, and the houses were rabbit warrens, inhabited by a wretched mixture of Turks and mixed breeds. He managed to learn there were not so many Servians; for Servians are not fond of living in towns. They are farmers and herders, and by choice they live in the open country, which is why they are a hardy and long-lived race.

But the new palace seemed to him a fine building, and he was lucky enough to see old King Peter, with his white hair and his fine, sturdy face, drive out of the grounds. A crowd had assembled, knowing that he was going to drive out, and it cheered the old man to the echo. Dick remembered how, for many years, King Peter had lived in Paris alone, in poverty, longing always for the time when he might return to the land his ancestors had helped to free from Turkish tyranny. And now this old man was an idolized king, who had led his people in two victorious wars and to-day was being urged by them to defy a country many times the size of his own. Dick took off his own hat and cheered with the crowd when the carriage passed him.

"I'm not a Servian," he said, to himself, "but he's a real man, and it won't hurt me to take off my hat to him, I guess."

Here in Belgrade there was far more excitement over the prospect of war than there had been in Semlin. Dick decided that this was because here much more of the truth was known.

He liked the looks of the newer part of Belgrade, beyond the palace. Here there were pleasant white houses, in green gardens, and everything was clean and well kept. The people, too, seemed to him more like real folks, as he put it. There wasn't a servile respect for a uniform. One reason for that, had he known it, was that when Servia went to war it meant that every man, and every boy old enough to carry arms, was engaged. It was a nation that fought, not just an army.

So it was with a pleasanter impression of the Servian capital than he had expected to acquire that Dick returned to Semlin. When he got back the sun was already low over the hills in the west, and he had just about time to hurry to his lodgings and change his clothes.

There he found something that surprised and angered him. In his absence someone had been through all his few belongings; few because he had of necessity traveled with little baggage. He could see that everything had been ransacked, and he guessed that the police had paid his room another visit in his absence. It hadn't done them any good, for of course he carried no papers that would have been of the slightest interest to anyone else, and his money, the only valuable thing he had, was always in the belt that he wore next to his skin, under all his clothes.

But he was angry, none the less, and he carried his anger with him to the consulate, where, arriving promptly, he had to wait a little while for the consul to finish some business. When he told Mr. Denniston what had happened the consul frowned.

"I'm not surprised," he said. "I couldn't prove this, Dick, but I've learned enough to be perfectly certain that Hallo is behind the police interest in you. I don't believe that anyone really thinks you are English, or has the slightest idea that you may be a spy."

"A spy! What kind of a spy would I make? Is that their line?"

"In a time like this almost anyone may be accused of being a spy, Dick. You see, the argument is that it's just the one that's apparently least likely to be guilty, who can be the most dangerous spy. But, as I say, in your case it's just an excuse. I have sent a cable message to the State Department, asking them to satisfy themselves through your scoutmaster at home that you are an American citizen. When I hear from that message, you see, you'll have an official standing, and I can do something. What I am afraid of is that the answer will be delayed. But come in to dinner. I shall have to leave you right afterward."

At the dinner table Mr. Denniston explained the situation more in detail to Dick.

"Hallo's powerful enough to have his way. That's the size of it," he said. "I've decided to have you come here, as my guest. They wouldn't dare to take you from the consulate for that would mean trouble with the United States. And if I don't read the whole situation mistakenly, they are going to have enemies enough before long without embroiling themselves with us, even for the sake of pleasing Mr. Michael Hallo!"

"I hate to trouble you, sir," said Dick. "But it is most awfully good of you to invite me, and, of course, I'd be safe here."

"It's no trouble—I'll be glad to have you. As soon as we've finished dinner, go and get your things, and then come right back here. They gave you twenty-four hours, you said, didn't you? And that was this morning?" returned Mr. Denniston.

"Yes, sir."

"Then I think you have time enough. But there is no use in leaving yourself in their power when the time is up. When they move here, they move very quickly indeed."

"All right, sir. I'll go along, and get back at once."

Dick hurried through his dinner, and then went back to his lodgings. In his room he began packing, but he had not finished his task, light as it was, when he heard a heavy pounding on the street door, which was at the bottom of the stairs, directly in line with his own, his room being on the first floor. He was curious enough to open his door to listen, and he saw the woman of the house open the street door.

"In the name of the law," he heard a heavy voice say. "We have come to take one Richard Warner, calling himself an American, who is accused of being a spy, and is to be sent immediately to Buda-Pesth. Stand aside!"

"Yes, sir—yes—right up the stairs, there," stammered the frightened woman.

Dick was aghast for a moment. Then, by a sheer instinct of self-preservation, he flung the door shut, locked and bolted it. It was stout and would hold for a moment. He rushed to the window. It was an easy drop to the garden below. But of what use to drop? What chance was there for him to make his way through the streets to the consulate, where, could he but reach it, he might find asylum? It might be better to yield. Though he was not a coward, he knew that the police might shoot him.

And then, just as heavy footsteps came up the stairs, a voice spoke in his ear.

"Will you trust me?" it said.

He turned with a start, to see the boy of Hallo's office beside him!

"Follow me—through the window. I can save you," said this boy. "It is I they should seek—I am a spy!"