Morgan's face lit up with understanding. Going over to Tierney, he whispered in his ear.

"Well, I'm d.a.m.ned!" Tierney mumbled.

The three men then climbed the stairs to the Atwood apartment, and Morgan's hand was already on the push b.u.t.ton of the electric bell when there was an exclamation from Marsh.

"Stop!" he cried. "Look here."

They instantly saw what he meant. The wood door was standing open about two inches, and there was sufficient light in the entrance hall of the apartment to show that at least no one was looking out.

"Remember, I'm in the background on this," Marsh whispered to Morgan. "You two take, the lead--but be cautious."

Morgan pulled out his revolver and Tierney followed his example.

Then Morgan gave the door a quick push and stood back. It swung back against the wall with a resounding thud, but outside of that sound everything remained silent. The three men then moved warily into the doorway, with Tierney and Morgan in the lead. While Marsh remained in the entrance hall, Tierney stepped into the living room and Morgan crept cautiously through the portieres into the dining room.

So silently did these two men move that Marsh heard, nothing until, a moment later, he saw Morgan step back through the portieres. The doors of both the bedroom and the bathroom stood open and Morgan, without saying anything to Marsh, investigated these two rooms. Then he returned to the entrance hall and spoke to Marsh, who had already been joined by Tierney.

"Not a soul in the flat but the girl," whispered Morgan. "She's in a chair in the dining room, and apparently unconscious again. There's an odor of chloroform in the dining room!"

Marsh sprang through the dining room portieres, followed by the others. He found Jane Atwood in a rocking chair near one of the windows. She was apparently unconscious, but there were convulsive movements of her body. Marsh sniffed the aromatic odor and nodded.

"I don't think they gave her much," he said. "She's just barely unconscious. I'll try to revive her while you two look things over more carefully."

Morgan turned to Tierney. "You take another look at the front," he directed. "Look through all the drawers and closets, but be careful not to leave anything upset."

Tierney promptly started on his work of investigation. Morgan turned back into the kitchen. He had previously noticed that the maid's room was upset and he wanted to examine this room again. The bed was made up, but as the linen was fresh and unwrinkled it seemed certain that no one had occupied it recently. The chief cause of the disorder seemed to have been a hasty examination of the closet. A roll of blankets and some other articles that had evidently been on the shelf of the closet had been pulled down and scattered over the bedroom floor. A couple of suits, and other articles of men's attire, were hung on the hooks, apparently undisturbed. Morgan saw that a speedy search had been made for something. Whether or not the object had been found it was impossible to say.

Going back into the kitchen, and trying the rear door, he discovered that, though closed, it was unlocked. He locked it, and returning to the dining room, found that Marsh had succeeded in reviving the girl. Tierney was also there, and the two men were chatting with her.

"You seem to be having a good deal of trouble today," said Morgan, as he neared her.

She smiled wanly at him.

"I can't understand it at all. Burglars must be extremely bold in Chicago."

"Do you think it was a burglar?" asked Morgan.

"What else could it be?" she returned. "I am sure that I have no enemies anywhere, and I haven't even any friends in Chicago."

"Are you keeping anything of special value in the house?" inquired Morgan.

"Only what you can see about you," she replied "And these rings, which have not been touched."

"You are sure you didn't have anything of value concealed in the maid's room?"

"No, that's the room my father uses when he comes home from his trips."

"Well, perhaps he had something of value there."

"I'm quite sure he did not," she said, positively.

"How do you feel now, Miss Atwood?" asked Marsh, catching the drift of the questioning.

"Just a little bewildered," she replied, "and slightly nauseated, but I think I shall be all right presently."

"Do you feel equal to looking over that room now?" Marsh inquired.

"I think so," she said, and with Marsh's a.s.sistance, she arose from her chair.

Morgan led the way and the girl, leaning on Marsh's arm, followed.

"You see," said Morgan, when they had reached the maid's room, "somebody has pulled everything off the shelf. Is there anything missing as far as you know?"

Miss Atwood looked over the articles on the floor, glanced at the empty shelf, and at the bottom of the closet. Then she turned to Morgan. "My father had a suitcase on that shelf," she said. "I do not see it there now."

"Oh," murmured Morgan. "Was it an empty suitcase?"

"I really couldn't tell you. I never examined it, as it was always pretty well hidden under a lot of other things."

"I see," said Morgan. "The burglar evidently stole only the suitcase, thinking perhaps there was something of value in it. We'd better go now," he added, turning to the others. "Miss Atwood will want to lie down and rest after her exciting day."

When they reached the front door, Morgan turned to her. "Do you expect your father home soon, Miss Atwood?" he inquired.

"Oh," she exclaimed, "I haven't read my letter yet. You see, I had just reached the dining room when that burglar attacked me."

"You need not worry about any further disturbances or attacks, Miss Atwood," Morgan a.s.sured her. "There will be a policeman at the front and back of this house inside of an hour, and they will stay here until we clear up this case."

"And remember that I live close at hand, on the floor below, Miss Atwood," reminded Marsh. "If there is anything I can do to help you at any time, don't fail to call upon me."

"Thank you," she replied, and closed the door as the men went down the stairs.

CHAPTER XI

THE TRAIL GROWS CLEARER

"I want to use your telephone for a minute," Morgan said to Marsh, as they went down the stairs. "I want to have men put on duty here as soon as possible, and I think it would be well to send out that description you have of Atwood. We might catch him at one of the railway stations, trying to leave the city."

Marsh unlocked the door of his apartment and Morgan immediately went to the telephone. He gave the Detective Bureau a description of Atwood, added that the man would probably be carrying a suitcase, and suggested that all outgoing trains be watched. Then he got the captain of the precinct on the telephone, and after explaining the attacks that had taken place, was a.s.sured that two men would be placed on duty to watch the house within a few minutes.

"Good Lord, I'm starving to death!" cried Tierney, as Morgan left the telephone. "What time is it, anyway?"

Morgan glanced at his watch.

"Three-thirty," he replied. "Now you speak of it, Tierney, I feel kind of hungry, myself. How about you, Marsh?"

"It was on my mind to suggest a little luncheon," returned Marsh.

"Suppose we run down to Sally's Waffle Shop. It's only a block south, and it would be a quiet place to talk things over while we are eating. It is a good place to eat, too. I've had nearly all of my meals there since I took this apartment."