They'll have made her go in there so that her light won't show, as it would if she were in the kitchen."
Nick went to an engine-house near by, where he secured a coil of knotted rope.
He wished to make his investigations secretly, so as not to put Jones on his guard. It would not have been safe to get into the flat by the ordinary methods.
By using the fire escape of the building next door to the flat house, Nick got to the roof.
The top of the air shaft was covered with a framework, in which large panes of glass were set.
Nick removed one of them. Then he made his rope fast, and crept through the space where the glass had been.
The Jones' flat was next to the top, so Nick had a short descent.
But there was an awful stretch of empty air under him as he hung there.
The shaft went to the basement floor, about seventy feet below the level of the window which opened into the room occupied by the Jones' new servant.
He found that window readily. One glance through it was enough to satisfy him.
There sat the colored girl, reading a book. Nick's suspicions had been correct.
Naturally he did not delay very long in the air shaft. He had a hard climb to make, hand over hand, to the roof.
The instant that his eyes rested on the girl, he began the ascent.
He had gone up less than six feet when the rope suddenly gave way, and he found himself plunging downward through the shaft.
CHAPTER VII.
THE WARDROBE OF GASPARD'S FRIEND.
Nick Carter is hard to kill. A good many crooks have tried to put him out of the world, and a fair percentage of them have lost their own lives in the attempt without inflicting any injury upon Nick.
He is a man of resources, and that's what saves him. When one thing fails him, he finds something else to take its place.
And so, when that rope gave way, he took the next best thing.
That happened to be the sill of the window of Mr. Jones' bath-room. Nick seized it with a grip of iron as he shot downward.
The strain on his arms was something awful, but he held on. His fingers gripped the wood till they dented it.
In two seconds he had scrambled through the window into Jones' flat.
It was done so noiselessly that the colored servant in the room directly opposite, across the narrow shaft, was not disturbed in her reading.
From the bath-room Nick made his way to the hall, and thence to the parlor, where Mr. Jones--to judge by the light in the window observed by Musgrave--had decided to spend the evening.
Mr. Jones was not visible when Nick looked into the room.
The bedroom adjoining was also empty.
Nick ran through the flat, but saw nobody. He returned to the parlor, and there stood Mr. Jones under the chandelier.
"Well, upon my word!" exclaimed Jones, "how did you get here?"
"I might ask you the same," said Nick, "but it isn't worth while."
"I've been here all the time."
"Except when you were on the roof."
"Nonsense! What should I be doing on the roof."
"It wasn't what you were doing; it was what you were undoing that bothered me. You were undoing the knot with which I fastened my rope before I descended your air shaft to get a peep at your servant."
"Nonsense again, Mr. Carter. How could I get to the roof?"
"I'll show you just how it was done. In the first place, you saw me coming back to the house, and you guessed what I was going to do.
"You went into this room," and Nick dragged Jones into a sort of closet adjoining the parlor, "and you got out of that window onto the fire escape.
"That led you to the roof, and the rest was simple. You saw me go down, and you tried to make me go down farther and a good deal faster. But you failed, and the game's up. Now come to headquarters again."
"What for?"
"For trying to kill me. That's the charge against you. And I haven't got through with you on that other matter."
"But for heaven's sake pity my wife!"
"What's the matter with her?"
"She will be crazy when she gets back and finds me gone."
"One of my men will tell her where you are. Why did you lie to me about her going out? I've a great mind to place her, too, under arrest."
"You can't do it. It's no crime to dodge a detective. I admit that she did it, but for a very innocent purpose. She has gone to see our lawyer."
"Very well; I will attend to that later. Now, come with me."
Nick took Jones to the street. Musgrave got a policeman, and Jones was put in his care.
Musgrave remained on the watch for Mrs. Jones, while Nick went to get a report from Patsy, who was shadowing Gaspard.
Jones' last words to Nick were these: