Nicholas Carter 
A Fatal Message [EPUB ebook] 

Nick Carter leaned nearer to the wall and listened to what the two men were discussing.
The wall was that of a booth in the café of the Shelby House. It was a partition of matched sheathing only, through which ordinary conversation in the adjoining booth could be easily overheard, and both men in this case spoke above an ordinary tone.
Obviously, therefore, they were discussing nothing of a private nature, or anything thought to be of much importance, or serious significance. It meant no more to them, in fact, than it would have meant to most men, to all save one in a million.