An Eye for an Eye by William le Queux

I glanced behind me, but saw no sign of Boyd. Of a sudden it crossed my mind that he had not been present at our first discovery; therefore, expecting a man to keep the appointment, he had allowed her to pass the spot unnoticed.

The appearance of that neat figure before me, the figure of the woman over whose beauty I had mourned as dead, was in itself a most startling fact, adding still another feature to the already dark and inscrutable mystery. I wanted to have a word with Boyd and ask his advice, for I knew not how to act in such unexpected circumstances. One of the victims was actually keeping an appointment with an accomplice of the assassin, for there seemed no doubt that murder had been committed by some secret means.