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100 the roof at night—and an airplane makes a lot of noise. And we didn't hear a sound—remember that!"

Once more the voice of the Black Star reached their ears. He seemed to be shouting to them, and to be not so very far away.

"Good night, gentlemen!" he called to them. "It has been a splendid evening of amusement and profit. Good night—and let me express the hope that you'll have pleasant dreams!"

That was all. Though they waited on the roof for half an hour longer, they heard nothing more from him, saw nothing of him, and finally they turned and went back down the stairs, puzzled, angry, but determined to make the master rogue pay.