But although he spoke hopefully, Tom’s inner senses told him that the daring marauder had done more than merely alarm them. In the first place, there was the shot coming from the direction of the black fox’s cage. To Tom that could mean only one thing and that was that the intruder had killed the occupant of the cage. In fact, that was the only way that he could have secured his prey, for the foxes were wild and savage to a degree, and it would have been impossible for anyone to abstract them alive.

All these thoughts and conclusions flitted through his mind while Jack and Sandy, at his orders, were getting a lantern. When it arrived, the three boys in any but enviable frames of mind made their way as quickly as possible to the fox cages.

The animals were excited and frightened, and through the darkness their anxious eyes glowed like jewels as the lantern light struck them. This showed Tom that at least six of the cages still held their occupants. But the seventh, the one that had been used to hold the black fox, was apparently empty.

When they reached the pen in question even Tom could not refrain from exclamations of anger, for the cage had been ripped open and the black fox was indeed gone.

On the snow were blood-stains in plenty, and enough mute evidence of the slaying and theft to enable them to reconstruct everything that had happened as well as if they had seen it all.

“Oh! wow! Fifteen hundred dollars gone ker-plunk!” wailed Jack.

“Hoots-toots,” clucked Sandy, clicking his tongue indignantly, “the bonny black fox killed and taken by that gloomerin’ thief!”

Tom alone was silent. The suddenness and completeness of the catastrophe had overwhelmed him. What could they say to Mr. Dacre and his partner when they returned from the settlement? What explanation could they make that would excuse their seeming carelessness?

As Tom stood there beside the empty cage with the blood-stained snow at his feet, he passed through some of the bitterest moments of his life. He was fairly at a standstill. In the dark it would be impossible to overtake the bold thief, and there was no means, of course, of sending out a warning as might have been done in a civilized region.

No; the thief had vanished and there appeared to be not the remotest chance of ever catching him. Any trader would be glad to buy the black fox skin, and with the proceeds the marauder could easily leave the country, leaving no trace behind him.