Sentence:  "Upon West Tenth Street," said the devil, quietly. / "I find it flattering, sir, that you should have preserved a so accurate account of my past doings in that morocco-bound <WSD>red book</WSD> of yours," said Diego, somewhat startled, but still speaking equably. 
Meaning of the word marked with <WSD> tags:  A book supposedly belonging to the devil and containing the signatures of those in league with him.