The inspector had already struggled to rise. He conceded the importance of this unexpected call. He apologized for his failure.

"Nora's got me wound up like a mummy--"

Alsop broke in rapidly.

"No politeness, inspector. I must speak to you. I'm up against it.

They're after me."

He sat down heavily. The young man, whom he introduced as his secretary, Arthur Marvin, lighted a cigarette with trembling fingers. Garth watched them both while the inspector explained that they might speak freely before him and Nora. Alsop, he knew, because of his genius for organizing money and industry, and his utter ruthlessness in dealing with those whom necessity had thrown within his power, had made dangerous and active enemies. Garth was aware, moreover, that recently Alsop had publicly defied certain organizations which had asked what he believed to be too much. The detective could understand the financier's position. His death might be a cheap risk for outside fanatics to take to destroy his leadership against the forces of radicalism, for there were few men strong enough to replace him. Alsop had a newspaper in his hand now, and was holding it out to the inspector, while with his forefinger he tapped the paragraph which told of Brown's accident.

"No accident," he muttered. "That man worked for me--a precaution any fool would take. Well, he must have found out what he was after last night, and they got him, and thought they had killed him. They tell me at the hospital he's still unconscious."

Nora smiled at her father.

"A cheap automobile case!" she reminded him softly.

Alsop handed Garth a crumpled, torn, and soiled post-card.

"That came in the noon mail. Must have been picked up by somebody and dropped in a post box. I figure Brown, before they got him, threw it out of a window, or some such thing. Anyway that settled it. It brought me here for a quiet talk."

Garth read the card. A single line, almost undecipherable, sprawled across the back:

"Danger to-morrow night. Brown."

"That means to-night," Garth said. "Had you planned anything important for to-night?"

Marvin laughed a little. Alsop spread his hands.

"The conference with capitalists and politicians at which we settle on certain legislation that will put some of these foreign anarchists on the skids, s.n.a.t.c.h American labor beyond their influence, and give the honest business man a chance to make a fair profit by driving his men as he should. See here, inspector. I'm not afraid of good Americans. They may put me out of business, but if they do, I'll know I've been beaten in a fair fight. It's these d.a.m.ned foreign anarchists and some sore central Europeans I'm afraid of. I expect some important men from Wall Street and Washington to-night. I can't let them walk into a bomb, and I don't want any high explosives myself."

The inspector grunted.

"Nasty situation. I'm no politician. Fight crime. We'll see what we can do. It's a good thing you found Garth here."

Garth, who had not ceased to study Alsop's face, realized that the man had more to report--something which he shrank, however, from mentioning.

"What is it, Mr. Alsop?" he asked. "You've something else to tell us."

Nora, who had clearly noticed the same symptoms, nodded approvingly.

Alsop flushed and glanced at Marvin. The secretary knocked the ashes from his cigarette. The trembling of his fingers was more apparent.

"You should tell that by all means, Mr. Alsop," he said in a low voice.

"That's what I want to find out. If I don't get some explanation of that I'll doubt my sanity."

Alsop cleared his throat.

"A ghost story," he said with an attempt at a laugh. "Fact is, Marvin and I and some of the servants are haunted by a veiled woman."

Nora came closer. The inspector turned back to the fire a little contemptuously. But Garth had no doubt that this hard-headed business man was serious.

"Go on," he said softly. "You think this ghost is connected with a dangerous conspiracy against you?"

"I can only tell you facts and let you judge," Alsop answered. "I daresay you know about my house on the river near the city line. It is lonely for that neighbourhood, and very old. I've always heard stories about a ghost, a veiled woman on the upper floor--some connection with the suicide of a beautiful girl long ago. You know the sort of thing.

It's always told about old houses. The point is, I saw that veiled woman last night, and she gave me rather too much evidence of spirituality."

"Why do you connect a ghost with anarchists?" the inspector demanded.

"Because," Alsop answered, perfectly seriously, "I believe the thing was after my papers."

Garth laughed outright.

"Then why suspect your visitor of being a ghost?"

"Because," Alsop said patiently, "this visitor had every appearance of walking through a locked door."

Nora alone was thoroughly impressed.

"Tell us," she urged.

"I've a safe in my room," Alsop said, "and as an extra precaution, when I've had important papers at the house, I've locked my door. I went upstairs late last night. There was no light in the upper hall, but a glow came from the lamps downstairs. In this sort of radiance I saw the figure of a woman, clothed in white, her face hidden behind a white veil, come apparently from my room, cross the hall, and disappear. I cried out. I sprang for the door. It was locked. Marvin and I searched the house. My daughters are in Florida. The only women in the place were servants. There seemed no way in or out of the house without the collusion of one of these. And I've had them a long time. It's hard to suspect them. Besides, Marvin has had much the same experience. Tell them, Arthur."

"As a motive," Marvin said slowly, "I might mention the fact that I often take my work upstairs--letters of Mr. Alsop's to answer, statements to make out. The first time the thing happened was Thursday night. It must have been after midnight. I was in bed. I awakened with that uncomfortable feeling of being no longer alone. At first I saw nothing. The only light in the room came from a dying moon. I had been nervous for several nights, fearing an attempt on Mr. Alsop. I never could get him to take that very seriously until to-day. At any rate, after a long time, I saw this figure that Mr. Alsop describes. It did not seem to come from anywhere."

He commenced to pace up and down the room. There was about the sudden gesture of his hand a despairing belief that shocked Garth.

"The thing--white veil and all--seemed to materialize out of nothing. It moved softly about the room as if searching--searching. I thought of the letters on my desk. I called out instinctively, 'Who's there?' There was no reply. The figure did not hurry. It stepped behind a screen by the fireplace. I sprang up and went there. I couldn't believe the evidence of my eyes. There was no one--nothing behind the screen. I examined the door. It was locked as I had left it, with the key on the inside. There was no way in or out of that room. Yet the veiled woman had been there, and had gone, leaving no trace."

"The windows," Garth said, "or the fireplace?"

Marvin shook his head.

"The windows were scarcely open, and a fire burned in the fireplace.

And, mind you, this was before Mr. Alsop had seen the woman. I mean, he had not suggested the vision to me. The same thing happened last night.

That figure came searching and disappeared in the same impossible way. I knew I wasn't dreaming then. I spoke of it to Mr. Alsop. It frightens me. I want an explanation of that."

"Catch your enemies and you'll catch your ghost," Garth said drily. "I'd like a shot at both."

"What you want," the inspector said to Alsop and Marvin, "is protection for yourselves and your distinguished guests. What the police want is to catch these fellows red-handed. We'll try to fit the two things. Don't lose your nerve. Go ahead with your conference, and trust Garth to find out how your veiled woman gets in and out of the house and through locked doors. I should say if we find her we should have the brains of the conspiracy. There may be no danger for you to-night. We've only Brown's post card to go on. That looks serious, and I'll do my best to protect you. But you must give me every chance to nab these birds. This sort of thing's getting too bold. There's too much foreign propaganda in this country. It would please me to throw the fear of Uncle Sam into such people."

And when Nora had gone to the door with Alsop and Marvin, he called Garth over, and hurriedly whispered:

"It's a big chance, Garth, but dangerous as dynamite. These fellows won't hesitate to blow that house up if they can't block Alsop's dirty politics any other way. And remember, you're fighting a woman who behaves like a ghost. Take it from me, she's the one you've got to be afraid of. She has the brains."

"If I could get something out of Brown," Garth mused.

"Maybe he's conscious now," the inspector said. "Run up to the hospital, then look over the neighborhood where he was found. Come back here by five, and we'll lay our plans."

Nora stopped Garth in the hall.