“Robbery, I fancy,” replied Nick; “and that carriage contains the thieves and what they’ve stolen.”

“We’d have to be race horses,” said the officer, looking after the carriage now disappearing in the distance, “to overcome that lead.”

“No; it is useless to attempt to follow it,” replied Nick.

“Where was the job done?” asked the officer.

“Up there in Thirty-fifth Street,” replied Nick. “Is that your beat?”

“Yes, and I was over it half an hour ago.”

“They waited for that,” replied Nick. “Come with me and let us look at the house.”

They went back to the house, where Nick pointed out the open bay window and the short end of the rope dangling therefrom.

The officer went inside the little yard and found the rope that had been cut off lying on the ground.

He picked it up, and, looking at the end, said: