he had written it on a leaf torn from his notebook. I took the note from him, observing at the time that the paper had no pin holes. Probably, Mr. X. saw that there was something amiss; he presently went back downstairs, took the remainder of the torn leaf from his notebook, and pinned it to the door. A little later, I met him and mentioned the lack of pin holes; he calmly referred me to the piece on the door, saying that he had merely torn off the note without removing the pins. You follow me?"
"Of course," murmured the girl, her eyes wide in fascinated interest. "And he knew that you guessed him to be the Masquer?"
"He suspected me, I think," said Fell, mildly. "It is understood that you will not go about tracing these little clues? I do not wish to disclose his identity, even to your very discreet brain"
"Don't be silly, Uncle Jachin!" she broke in. "You know I'll do nothing of the sort. Go on, please! Did you find the airplane?"
"Yes." Jachin Fell smiled drily. "I was thinking of that as I left the house and came to the line of waiting automobiles. A word with one of the outside detectives showed me
