"The one that ran through the tunnel."
Miss Kilmeny shook her head. "I didn't see anybody tap. Perhaps one of us touched it by chance."
"No. That couldn't be. The tap came seven times together, and after I had answered it seven times more."
"Seven times?" asked Bleyer quickly.
"Yes—seven. But, if you didn't tap, who did?"
"Sure it wasn't imagination?" Verinder suggested.
"Imagination! I tell you it was repeated again and again," Moya said impatiently.
"Spirit rapping," surmised Joyce lightly. "It doesn't matter, anyhow, since it served its work of comforting Moya."
"It might have been some of the workmen," Lady Farquhar guessed.
"Must have been," agreed Bleyer. "And yet—we're not working that end of the mine now. The men had no business there. Odd that it was seven raps. That is a call for help. It means danger."