“She probably is the same one,” said Chick.

“Impossible!”

“Why so?”

“The other just went upstairs. She cannot be in two places at once.”

“She may have come down. There is a side stairway.”

“She would not have had time when you called my attention to her. She had only disappeared at the head of these stairs.”

“There can be only one explanation,” said Chick. “There are two women wearing similar costumes. There evidently is, as you put it, a duplicate Night.”

Nick had been watching this second woman while they were talking, and his brows had knit perceptibly.

“She appears a bit nervous and in a hurry, like the other,” he muttered, after the masked woman had gazed into two of the rooms in which the dance was in progress. “She evidently is searching for some one.”

“Some one she knows, then, or with whom she came here,” said Chick. “She could not identify any one else, unless informed of the wearer’s costume.”