"The only comfort is the confidence I have in Tom"s luck," said Bart "That boy sure must have a rabbit"s foot around him somewhere. He has as many lives as a cat. Do you remember how he got away from that drunken German bunch that had a rope all ready to hang him? And the slick way he got away in a barrel from the prison camp? I tell you that the bullet isn"t molded that will kill that boy, and don"t you forget it."

"I only hope you"re right," returned Frank. "All the same I"ll feel a whole lot easier in my mind when the old scout is with us again."

Just then a litter pa.s.sed them carrying a sick man to the hospital ward.

"Those things are getting a little too common to suit me,"

remarked Frank. "The health of the boys here used to be fine. Now they say that the hospitals are getting overcrowded."

"And a good many of those who go in aren"t coming out again, that"s the worst of it," observed Billy. "That cemetery on the hill is getting altogether too full."

"If this mysterious disease isn"t checked it will be worse than the "flu,"" said Bart. "What"s the matter with our doctors anyway?

Why don"t they get on the job?"

"You can"t blame them," Frank defended. "There"s no better medical staff in any army than the one we"ve got. They"re working like mad to try to isolate the germ, or whatever it is, that"s causing this mysterious trouble. But they seem to be all at sea in this matter.

It"s an entirely new thing, and they haven"t found any way to conquer it."

"It would be rather hard luck to come through St. Mihiel and the Argonne, and then to be knocked out by a measly disease like this," said Billy disgustedly.

"Well, it hasn"t got us yet, and let"s hope it won"t," said Frank.

"But now that we"ve got a chance, what do you fellows say if we go over tonight and try to get at the bottom of that alley mystery? I shan"t be easy in my mind until I"ve solved it."

"Always looking for trouble," laughed Bart. "But I don"t mind confessing that the matter"s got tight hold of me too, and I"m game to see it through to a finish."

"Count me in," said Billy.

"If only poor Tom were with us!" mourned Frank "It"s just the kind of thing he"d like to trail. And if there should happen to be any sc.r.a.pping, he"d be a mighty handy lad to have along with us. He"d rather fight than eat any time."

After the drills and work of the day were over they got permission to go to the town and started across the river just as twilight was falling.

While pa.s.sing through one of the streets, they met the famous German physician, from whom they customarily got a look that betrayed his hate of the American uniform. But this time, to their surprise, he was rubbing his hands and seemed to be in high good humor.

"What"s come over his nibs, I wonder," remarked Billy. "Usually he seems to have a grouch of the worst kind, but to look at him now you might think that he"d just had news of a good fat legacy."

"He is different, for a fact." agreed Bart. "He couldn"t look happier if Germany had won the war."

They looked after him, and saw him vanishing into the doorway of a dwelling that was really a mansion.

"Swell place that," observed Billy. "He must have a peach of a practice to live in a house like that."

"He"s one of the most famous men in his line in Germany I"ve heard," commented Frank.

"They say the Kaiser himself used to consult him. But of late they say that he"s made himself almost a hermit. Seems that he"s given up his regular practice, and simply nurses his grouch because Germany was licked."

"He sits up pretty late to do it then," put in Billy. "I"ve been on sentry duty in this street, and many a time I"ve seen a light in his office until almost morning."

"Here"s our corner," Frank said, as they came to the next street.

They approached the alley with the utmost caution, and slipped into its darkness when they felt sure that they were un.o.bserved.

"That"s queer!" exclaimed Frank, gazing above the blank wall at the outline of a tall building that rose beyond it.

"What"s queer?" asked Billy.

"Why, that building there is the same one the doctor went into,"

answered his companion. "I know it by that cupola on the top. It must back up right against this wall. In fact, this wall is part of the rear wall of the house. I thought these were only factories."

"Oh, well, what if it is?" returned Bart. "We"d better get busy here before we"re interrupted. Let"s hope there isn"t another fire in this district to-night."

Without much difficulty they found the square place that Frank and Bart had noticed on their previous visit. They sc.r.a.ped away the ice and gravel and discovered the ring by which the trap door was evidently raised. Then they braced themselves and gave a mighty tug.

But the effort was unavailing. They were far stronger than the ordinary run of men, and yet even their trained muscles had to confess defeat.

"Perhaps it"s locked or bolted on the other side," suggested Bart.

"Not likely," answered Frank. "It"s more probable that it"s frozen in. Get out your knives and dig around the edge of the door, and then we"ll try again."

They did this for perhaps five minutes, and then tried again.

This time the door moved but did not yield. Once more they bent their backs to the work, and this time they won. Slowly and creakingly the door rose, showing a yawning chasm beneath, while a rush of fetid air a.s.sailed their nostrils!

CHAPTER XVII

A PERILOUS SITUATION

The three Army Boys started back almost letting go the trap door in their desire to escape the noxious odor and fill their lungs with the cool winter air.

"What is this anyway--the entrance to the infernal regions?" asked Billy.

"If it were, it couldn"t smell much worse, I imagine," answered Bart.

"We"re not going to let a thing like that hold us back, are we?"

asked Frank impatiently.

"Of course not," replied Billy. "But that doesn"t say we have to like it, does it? Flash that light of yours and let us see just what this sweet smelling thing looks like."

Frank directed the rays of his flashlight into the gloomy recess, and the light fell on a small platform about four feet below the level of the ground. Two or three stone steps descended from this and then they could faintly see a rough stone floor from which several pa.s.sages branched out in different directions.

He returned the light to his pocket, and the three held a whispered conversation.

"Well, fellows, you"ve seen as much of it as I have," said Frank.

"What do you say? Shall we explore it?"

"Sure thing," replied Bart. "What do you think we are, a bunch of four flushers?"

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