“Draw them together, quick!” she whispered.

Nick Carter had not the slightest idea what this was all about. But the mystery of it appealed to his love of adventure, and he closed the curtains at once.

“Be careful, Marcos,” went on the girl, in a tense, hushed voice. “They know you are here.”

“The deuce they do!” thought the detective.

“I have had a warning,” she continued. “They are going to send you up something to drink. But you must not take any of it.”

Nick Carter stared down at the masked face, and noted the general poise of the slight figure with admiration. Mingled with it was perplexity.

“I am sure you are making a mistake,” he told her. “Who do you think I am?”

“Don’t be foolish!” she rejoined impatiently. “I tell you there is danger. I told you not to come here. But you insisted. Now see what has happened. Don Solado and Miguel have recognized you already.”

A loud knock came at the door. The girl leaped away, and her eyes shone through the slits in her mask like half-hidden incandescent lights.

“There! I told you!” she gasped. “Where can I hide?”