“Well, never mind, then; I can get another cab across the bridge,” replied the stout blond man, turning away and strolling off leisurely in the direction of the bridge. It was now quite dark, and a few steps further on Muller could safely turn and take the road to his own lodging. No one saw him go in, and in a few moments the real Muller, slight, smooth-shaven, sat down at his desk, looking at the papers that lay before him. They were three letters and an empty envelope.

He took up the last, and compared it carefully with the envelope of one of the letters found in Winkler’s room—the unsigned letter postmarked Hietzing, September 24th. The two envelopes were exactly alike. They were of the same size and shape, made of the same cream-tinted, heavy, glossy paper, and the address was written by the same hand. This any keen observer, who need not necessarily be an expert, could see. The same hand which had addressed the envelope to Mrs. Adele Bernauer on the letter which was postmarked “Venice,” about thirty-six hours previous—this hand had, in an awkward and childish attempt at disguise, written Winkler’s address on the envelope which bore the date of September 24th.

The writer of the harmless letter to Mrs. Bernauer, a letter which chatted of household topics and touched lightly on the beauties of Venice, was Mrs. Thorne. It was Mrs. Thorne, therefore, who, reluctantly and in anger and distaste, had called Leopold Winkler to Hietzing, to his death.

And whose hand had fired the shot that caused his death? The question, at this stage in Muller’s meditation, could hardly be called a question any more. It was all too sadly clear to him now. Winkler met his death at the hand of the husband, who, discovering the planned rendezvous, had misunderstood its motive.

For truly this had been no lovers’ meeting. It had been a meeting to which the woman was driven by fear and hate; the man by greed of gain. This was clearly proved by the 300 guldens found in the dead man’s pocket, money enclosed in a delicate little envelope, sealed hastily, and crumpled as if it had been carried in a hot and trembling hand.

It was already known that Winkler never had any money except at certain irregular intervals, when he appeared to have come into possession of considerable sums. During these days he indulged in extravagant pleasures and spent his money with a recklessness which proved that he had not earned it by honest work.

Leopold Winkler was a blackmailer.

Colonel Leining, retired, the father of two such widely different children, was doubtless a man of stern principles, and an army officer as well, therefore a man with a doubly sensitive code of honour and a social position to maintain; and this man, morbidly sensitive probably, had a daughter who had inherited his sensitiveness and his high ideals of honour, a daughter married to a rich husband. But he had another child, a son without any sense of honour at all, who, although also an officer, failed to live in a manner worthy his position. This son was now in Marburg, where there were no expensive pleasures, no all-night cafes and gambling dens, for a man to lose his time in, his money, and his honour also.

For such must have been the case with Colonel Leining’s son before his exile to Marburg. The old butler had hinted at the truth. The portrait drawn by Herbert Thorne, a picture of such technical excellence that it was doubtless a good likeness also, had given an ugly illustration to Franz’s remarks. And there was something even more tangible to prove it: “Theo’s” letter from Marburg pleading with Winkler for “discretion and silence,” not knowing (“let us hope he did not know!” murmured Muller between set teeth) that the man who held him in his power because of some rascality, was being paid for his silence by the Lieutenant’s sister.

It is easy to frighten a sensitive woman, so easy to make her believe the worst! And there is little such a tender-hearted woman will not do to save her aging father from pain and sorrow, perhaps even disgrace!