The Pink Ghost did not disappoint them. It came to the window on scheduled time--just as the shadows deepened in Franklin Square--and it waved its arms from the window and beckoned to the awed and puzzled multitude. Captain Delany gave a signal, and from front and rear his picked men swarmed into the empty house and rushed up the stairway. The Round Sergeant was in the van. He had been berated and ridiculed for not solving the mystery the night before, and he determined to be in at the death now. But as he crossed the threshold of the front room he started back in amazement and fell against the bluecoat behind him. The Pink Ghost was not in the window, but swaying and frantically waving on the west wall of the room. "My God! what is it?" cried the man behind. Norman could only point to the wall. His own hair was, he felt, actually raising his helmet off his head, and there was a curious contraction in his throat. In an instant, however, this had passed, and, with club in hand, he charged bravely upon the Ghost. As he neared it, however, a surprise awaited him. Instead of waving arms, he saw his own burly form shadowed on the outer edge of the pink nebula. He turned upon his heel, quickly bent over, and then burst into loud laughter. For him the riddle of the Pink Ghost was solved. "What is it, Norman? What is it, man? Is he crazy?" The other policemen pushed into the room to be enlightened, but the Sergeant only laughed the more immoderately. Delany became angry and started to seize Norman by the shoulder. This brought the Captain into the pink nebula and he understood Norman's hilarity. "By gad, that's funny," he cried, and he entered upon a joint spasm of mirth. The other bluecoats drew near, and as each came into the pink glow the chorus swelled. Such a lot of uproarious policemen had rarely been known in Baltimore. * * * * * Five minutes later Captain Delany and Sergeant Norman, having at last controlled themselves, left the closing of the house to subordinates and crossed the square to a house on Carey street, where they asked to see a young lady abiding there. She was a very stately and fine-looking young woman, and when she tripped down into the parlor the attractiveness of her face was heightened by a slight flush, due most likely to her wonderment at a visit from two policemen. When they left her ten minutes later her face was rosy red and her stately carriage had given way to a combination of mirth and embarrassment. But Delany had her positive assurance that there would be no more Pink Ghost.