“That’s what we are going to try to find out,” returned Nick. “Come here, Captain.”

The detective had picked up a pair of bedroom slippers that were partly under the bed. He held them close to the broad nostrils of the bloodhound.

“Seek, Captain!”

It took Captain a few moments to get to work. He seemed rather uncertain at first. Soon, however, he realized what he was to do, and, after padding about the carpet backward and forward, halting and sniffing at intervals, he made for the doorway.

“Come along!” whispered Nick. “He’s got the scent!”

The dog went down the staircase, sniffing on each stair, until he was in the lower hall. Then he crossed to what was obviously the drawing-room.

The door was opened for Captain, and he took advantage of this to cross the floor of the big room to the grand piano, which was open. Here he smelled about for a little while, and then suddenly trotted off at a tangent to one of the big windows that extended from floor to ceiling, and gave upon a side porch.

Nick Carter noted that the catch of this window was unfastened. He pushed open the casement, and out went Captain, across the porch and down the flight of steps close by.

“It is easy to see that the tenant here is only temporary,” remarked Nick, as he pointed to the neglected condition of the grounds. “The lawn has been cut in a sort of way, but the flower beds have not been weeded, and the edges of the lawn are grown up with long, straggly grass.”

“That’s true,” agreed the girl. “Marcos has not lived here long, and he would have been on his way home to Joyalita before this if there had been no interference with him.”