“And here is that one,” said Patsy, taking it from his pocket. “I found it on the roof of this house yesterday afternoon.”

Nick took it, remarking that it made the set complete, and added:

“Now for the model.”

He began a search of the rooms, and finally, turning to the two, who were holding Lannigan, said:

“Handcuff that man and tie his ankles, while we search for that model.”

This was done, and the three began an exhaustive search of the rooms, which ended in finding the model, badly broken, in a pasteboard hatbox in the bottom of a closet, covered with clothes.

“I think this can be patched up by a skillful man,” said Nick, after examining the model. “At all events, we have got all that we started out to get. Now, then, loose that man’s feet and we will take him around to the station house and lodge a complaint against him.”

By this time Lannigan seemed to realize that the game was up, as far as he was concerned, and he tamely submitted.

“Chick,” said Nick, when they were on the sidewalk, “you’d better get your man that you laid away on the stairway.”

Chick, followed by Patsy, went to get the unknown, but on arriving there found that he was no longer there.