The Phantom made another slight movement toward the cellar stairs. “I’m not at all sure Gage made the statement Pinto claims he made. My private opinion is that Pinto is a liar as well as a murderer. What the housekeeper said isn’t the only evidence I have against him. I hadn’t meant to tell what happened in the storeroom this morning; but since I was careless enough to leave my finger prints on the handcuffs, I might as well come out with it.”

Culligore’s mouth opened wider and wider as the Phantom related what had occurred in the storeroom during the early morning hours. When the story was finished, he seemed stunned, and the dazed look in his eyes told the Phantom his chance had come.

For an instant he flexed his muscles for action, then executed a swift and nimble somersault that landed him on his feet in the middle of the stairs. A spiteful crack told that Culligore had fired his pistol, but the Phantom was already at the bottom of the stairway. Then he dashed across the floor toward the point where the mouth of the tunnel was. He ran his fingers over the wall in search of the hidden door, the ingenious arrangement of which he had previously noticed.

Culligore, momentarily taken aback by the Phantom’s quick and unexpected move, was losing no time. Already he was scampering down the stairs in pursuit of the fugitive. The cellar was dark, save for the narrow shaft of light slanting down from the basement, and the Phantom heard him muttering to himself as he picked his way through the gloom.

After a few moments’ search the Phantom’s fingers found the tiny rift in the brick surface that marked the location of the door. Culligore, evidently hesitating to use his electric flash for fear of becoming a target for the Phantom’s pistol, was scudding hither and thither at the opposite end of the cellar. The Phantom crawled into the opening, feet foremost, and softly pulled the door to, then lay on his back, chuckling gently to himself as he pictured the lieutenant’s discomfiture.

He had no fear that Culligore would find his hiding place. The door was so carefully concealed that only a careful search would reveal its location, and the detective did not even suspect its existence. Yet the Phantom knew that he would not be safe for long. He could not remain in the tunnel indefinitely, and escape through the other end was impossible, for he had previously ascertained that the mechanism of the revolving window frame could not be manipulated from that side. All he had gained was time. He could only hope that his lucky star, which so far had never deserted him, would once more turn the situation in his favor.

His mind was working quickly while he listened to Culligore’s movements in the cellar. Doubtless the detective would soon summon assistance and have the building surrounded, and then, unless some chance and unforeseen development came to his rescue, the Phantom’s position would be critical indeed. Even if the searchers should not find his hiding place, he would eventually die from lack of air.

Suddenly his figure stiffened. He lay rigid, trying to account for the curious sensation that had just come to him. In a moment he knew what it was a faint current of air was stirring in the tunnel. At first he could not understand, for he was certain that both exits were closed, and the tube itself was air-tight. He worked deeper into the tunnel, trying to trace the mysterious current to its origin, and presently it came to him that, through some unaccountable circumstance, the other end must be open.

It was mystifying, but the stirring of air could be explained in no other way than that in some manner the revolving window frame had come open. He moved forward as rapidly as he could, hoping to gain the exit and get out of the zone of danger before the block was surrounded. By this time Culligore must have discovered that his quarry had in some inexplicable way escaped from the basement. Perhaps he was even now cursing himself for his vain-glorious boast that he would take the Gray Phantom single-handed and unaided.

The movement of air became more noticeable as the Phantom drew near the end of the passage. He proceeded more slowly now, moving forward by cautious twists and wrigglings, a few inches at a time, carefully calculating each motion so as to make no noise. There was something at once puzzling and ominous about the open exit, and he could not know what awaited him in the bedroom at the end of the tunnel.