Bourgonef's remark had been but too sagacious. The police were hoplessly baffled. In all such cases possible success depends upon the initial suggestion either of a motive which leads to a suspicion of the person, or of some person which leads to a suspicion of the motive. Once set suspicion on the right track, and evidence is suddenly alight in all quarters. But, unhappily, in the present case there was no assignable motive, no shadow darkening any person.  
An episode now came to our knowledge in which Bourgonef manifested an unusual depth of interest. I was led to notice this interest, because it had seemed to me that in the crime itself, and the discussions which arose out of it, he shared but little of the universal excitement. I do not mean that he was indifferent—by no means; but the horror of the crime did not seem to fascinate his imagination as it fascinated ours. He could talk quite as readily of other things, and far more readily of the French affairs. But on the contrary, in this new episode he showed peculiar interest. It appeared that Lehfeldt, moved, perhaps, partly by a sense of the injustice which had been done to Kerkel in even suspecting him of the crime, and in submitting him to an examination more poignantly affecting to him under such circumstances than a public trial would have been under others; and moved partly by the sense that Lieschen's love had practically drawn Kerkel within the family—for her choice of him as a husband had made him morally, if not legally, a son-in-law; and moved partly by the sense of loneliness which had now settled on their childless home,—Lehfeldt had in the most pathetic and considerate terms begged Kerkel to take the place of his adopted son, and become joint partner with him in the business. This, however, Kerkel had gently yet firmly declined. He averred that he felt no injury, though great pain had been inflicted on him by the examination. He himself in such a case would not have shrunk from demanding that his own brother should be tried, under suspicions of similar urgency. It was simple justice that all who were suspected should be examined; justice also to them that they might for ever clear themselves of doubtful appearances. But for the rest, while he felt his old affectionate respect for his master, he could recognize no claim to be removed from his present position. Had she lived, said the heartbroken youth, he would gladly have consented to accept any fortune which her love might bestow, because he felt that his own love and the devotion of a life might repay it. But there was nothing now that he could give in exchange. For his services he was amply paid; his feelings towards Lieschen's parents must continue what they had ever been. In vain Lehfeldt pleaded, in vain many friends argued. Franz remained respectfully firm in his refusal.
 
This, as I said, interested Bourgonef immensely. He seemed to enter completely into the minds of the sorrowing, pleading parents, and the sorrowing, denying lover. He appreciated and expounded their motives with a subtlety and delicacy of perception which surprised and delighted me. It showed the refinement of his moral nature. But, at the same time, it rendered his minor degree of interest in the other episodes of the story, those which had a more direct and overpowering appeal to the heart, a greater paradox.
 
Human nature is troubled in the presence of all mystery which has not by long familiarity lost its power of soliciting attention; and for my own part, I have always been uneasy in the presence of moral problems. Puzzled by the contradictions which I noticed in Bourgonef, I tried to discover whether he had any general repugnance to stories of crimes, or any special repugnance to murders, or, finally, any strange repugnance to this particular case now everywhere discussed. And it is not a little remarkable that during three separate interviews, in the course of which I severally, and as I thought artfully, introduced these topics, making them seem to arise naturally out of the suggestion of our talk, I totally failed to arrive at any distinct conclusion. I was afraid to put the direct question: Do you not share the common feeling of interest in criminal stories? This question would doubtless have elicited a categorical reply; but somehow, the consciousness of an arriere-pensee made me shrink from putting such a question.
 
Reflecting on this indifference on a special point, and on the numerous manifestations I had noticed of his sensibility, I came at last to the conclusion that he must be a man of tender heart, whose delicate sensibilities easily shrank from the horrible under every form; and no more permitted him to dwell unnecessarily upon painful facts, than they permit imaginative minds to dwell on the details of an operation.
 
I had not long settled this in my mind before an accident suddenly threw a lurid light upon many details noticed previously, and painfully revived that inexplicable repulsion with which I had at first regarded him. A new suspicion filled my mind, or rather, let me say, a distinct shape was impressed upon many fluctuating suspicions. It scarcely admitted of argument, and at times seemed preposterous, nevertheless it persisted. The mind which in broad daylight assents to all that can be alleged against the absurdities of the belief in apparitions, will often acknowledge the dim terrors of darkness and loneliness—terrors at possibilities of supernatural visitations. In like manner, in the clear daylight of reason I could see the absurdity of my suspicion, but the vague stirrings of feeling remained unsilenced. I was haunted by the dim horrors of a possibility.
 
Thus it arose. We were both going to Munich, and Bourgonef had shortened his contemplated stay at Nuremberg that he might have the pleasure of accompanying me; adding also that he, too, should be glad to reach Munich, not only for its art, but for its greater command of papers and intelligence respecting what was then going on in France. On the night preceding the morning of ............