Without a word, Billy and Henri classed the hunter outside as a decided enemy by hurriedly slipping through the aperture, the case smoothly shutting the way behind them.

It was not in the program of Ricker that his shop should be the scene of an arrest, and, too, it was now in his interest that the boys should escape the probe of any investigation.

Having disposed of this dangerous exhibit in his back room, the silversmith hastened to the front to pacify, if possible, the unruly intruder.

Ricker, showing his best professional smile, stepped between the frowning Cossack and the enraged clerk, speaking a sharp word of warning to the latter, and asking the former what it was that he desired.

“Ah, two boys, air drivers, you say? I know them not. Reported to be in my shop? There cannot be good eyesight around here. Everything is open. This way, please.”

The silversmith moved backward, closely followed by the Cossack and several others of his kind, and pulled the curtains aside, with a sweeping gesture of invitation to search at will.

Though the keenest of trackers in the great outdoors, the red riders were at a loss when it came to detective work within four walls. They prodded with their lances bundles of wrapping paper in the several dark corners of the workroom and poked their heads into all of the packing cases, but with cunningly designed entrances into secret apartments they had no experience.

At last, scowling and grumbling, the baffled searchers marched themselves out of the shop. As the Cossack, Nikita, passed out the queer clerk shook a fist at the crimson-clad back, mumbling frightful maledictions to himself.

The silversmith assumed a busy manner, shifting the stock display on the shelves, winding clocks, and generally bustling about as if making up for lost time.

All this time the boys were completely shut off from every sight and sound in the musty room behind the plate-case.