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172 accomplished the entire excavation and arranged the steps. Moreover, without a definite clue the police would never suspect such an entrance.

While Black carefully lowered the flag on the other side Garth glanced around. They stood in the kitchen shed of a house which, of course, faced the next street. Garth had no doubt that the place was masked with a physician's office, or, perhaps, an appeal for boarders, who, nevertheless, would always fail to find rooms available at the hour of their application. He saw nothing of the man who had admitted them by raising the flag. He was more disturbed than before, since he could picture the inspector's bewilderment on learning that he had entered the house which had been so recently raided and combed.

Garth had small time for speculation. He saw Black press an electric button. Faintly he heard the response from a muffled bell—two rings short, and one long. Almost at once the door opened a crack, but no gleam of light came through. Black muttered something unintelligible to Garth, and led him into a darkness as complete as that which had oppressed him in the empty house. Yet in spite of it he was sure it was a woman who had admitted them.

"This way," Black said.

Garth followed, scarcely breathing. Where would he find Nora? How would he find her?

A door opened ahead, and at last there was a