“No, no.  For, after all, how are we to explain that the man should have waited until now to claim his rights?”

“An accident, perhaps, Monsieur le Prefet, an obstacle of some kind.  Or else—­one can never tell—­the perverse longing for a more striking sensation.  And remember, Monsieur le Prefet, how minutely and subtly the whole business was worked.  Each event took place at the very moment fixed by Hippolyte Fauville.  Cannot we take it that his accomplice is pursuing this method to the end and that he will not reveal himself until the last minute?”

M. Desmalions exclaimed, with a sort of anger: 

“No, no, and again no!  It is not possible.  If a creature monstrous enough to commit such a series of murders exists, he will not be such a fool as to deliver himself into our hands.”

“Monsieur le Prefet, he does not know the danger that threatens him if he comes here, because no one has even contemplated the theory of his existence.  Besides, what risk does he run?”

“What risk?  Why, if he has really committed those murders—­”

“He has committed them, Monsieur le Prefet.  He has caused them to be committed, which is a different thing.  And you now see where the man’s unsuspected strength lies!  He does not act in person.  From the day when the truth appeared to me, I have succeeded in gradually discovering his means of action, in laying bare the machinery which he controls, the tricks which he employs.  He does not act in person.  There you have his method.  You will find that it is the same throughout the series of murders.

“In appearance, Cosmo Mornington died of the results of a carelessly administered injection.  In reality, it was this man who caused the injection to prove fatal.  In appearance, Inspector Verot was killed by Hippolyte Fauville.  In reality, it must have been this man who contrived the murder by pointing out the necessity to Fauville and, so to speak, guiding his hand.  And, in the same way, in appearance, Fauville killed his son and committed suicide; Marie Fauville committed suicide; Gaston Sauverand committed suicide.  In reality, it was this man who wanted them dead, who prompted them to commit suicide, and who supplied them with the means of death.

“There you have the method, and there, Monsieur le Prefet, you have the man.”  And, in a lower voice, that contained a sort of apprehension, he added, “I confess that never before, in the course of a life that has been full of strange meetings, have I encountered a more terrifying person, acting with more devilish ability or greater psychological insight.”

His words created an ever-increasing sensation among his hearers.  They really saw that invisible being.  He took shape in their imaginations.  They waited for him to arrive.  Twice Don Luis had turned to the door and listened.  And his action did more than anything else to conjure up the image of the man who was coming.