At last they hit Dupont street and ran on to Washington, where they turned up the hill, stopping in front of China alley. The Chinamen jumped out and stood for a moment. "All right, the coast is clear, doctor," one said in Chinese. "Take the box out and be quick," replied the doctor. This was done. Staggering under their load, the two Chinamen disappeared down the alley. "Now, Alice!" said the doctor, when presently they returned. "Dr. Garshaski, be sensible and let me go about my business," said Alice, in her calmest fashion, for she realized that it would be more than useless to display excitement now. "No," replied the doctor. "No, it cannot be. I have begun, and I am going to see the thing through. That's all there is about it." He got out and extended his hand to Alice, who accepted it and alighted. The two Chinks closed in behind her. In a few seconds they had vanished down China alley, where there was no hope of rescue, for although the alley is not the dark, mysterious affair it used to be before the great fire, it still retains much of its old character, and is a mighty dangerous place at night. They did not have far to go; the doctor retained his hold on Alice's arm. She had heard the click of cocking revolvers behind her, so knew what to expect. Suddenly the doctor turned in at a dark doorway and hurried Alice up an equally dark flight of stairs. This brought them to a long hall, which appeared to run through to Dupont street. Much of this property is now owned by American-born Chinese. The new structures erected on it were built to suit themselves. Just how true it it we cannot tell, but there are those who claim that the underground dens of Chinatown are not wiped out by any means; even that some of them have been reconstructed on more extensive lines. The doctor halted before a door at what seemed about midway in the long hall and proceeded to unlock it with a key. "In with you, Alice," he said, and he pushed her gently into what seemed to be a small elevator. Following her, the Chinaman crowded in behind her. The doctor clutched the wire rope, and the machine started to descend. "You see I'm letting you into all our secrets, Alice," he said with a grin. "I haven't required you to blindfold." If this was an attempt to start a flirtation it failed, for Alice made no reply. This elevator descended three stories; they had ascended but one flight of stairs, consequently they must be under ground, Alice reasoned. It stopped, and the doctor opened a door. Here there was a long passage little resembling the ugly secret passages of old Chinatown. This one was plastered, and from the walls hung Chinese mottoes. There were lights at intervals, and many doors opening off from it. Alice saw that it must extend through from China alley to Dupont street. The doors all had Chinese characters on them. These were not numbers. Each carried with it the word "door"; each was modified in some way.