They shook hands, and neither spoke again until they had reached the sidewalk, where, three blocks farther down, they concealed themselves in the deep shadows of a spacious doorway and awaited the expected return of the midnight visitant.

No one who has not had a similar experience can fully comprehend the thrill of suspense at such a time. He may have sought a human foe, in the open or in ambush, have stood guard at a solitary camp fire in the silent night, or passed a weary vigil in the jungle, prepared to meet any form of savage beast, but he is still a stranger to the sensation that comes to him who, in firm belief, awaits the coming of a midnight ghost.

As the passage of the cable cars on their trip next after midnight had heralded the return of the spectre on the previous night, Joyce warned his friend to be prepared for that event.

"After the car has gone and the coast is clear and quiet, go for it," he commanded.

"You bet!" was the answer, "and don't forget to be quick on the trigger."

At that instant a sharp tapping on a window, apparently a block above them, met their ears, and at the same time they saw the downward car mounting the hillside. As it approached, the noise increased to a loud rattle and then suddenly stopped. The car had no sooner passed and the hill become bare than the ghost appeared at the summit, gliding swiftly in mid-air, as on the previous occasions.

"There he comes!" the watchers exclaimed together, in excited whispers. "Remember now," whispered Nelson, "the moment he gets close enough we'll rush out, and when I say, 'Shoot!' you pump lead into that snowy skull, while I ladle some pellets between his ribs. Let him have it six times in succession. And don't forget, it's got to be all accidental,—we were frenzied with fear and shot in self-defence. Don't forget that, for we may have to swear to it."

By this time the skeleton was flying toward the block in which they were concealed.

"Now, then, rush for the middle of the street!"

They rushed, experiencing an awful moment, but when still within some feet of the apparition, a dark figure, armed with a long club, darted suddenly from a doorway on the opposite side of the street, and in another moment the spectre lay prostrate on the ground. Before the ghost hunters fully realized what had happened, they stood, breathless, behind the newcomer, as he, unconscious of their presence, stooped over his fallen quarry.