During the three years that followed, Darya was perfectly sane, but it appeared that my friend, Captain Alexandrovitch, while quartered at Deli Musa, in Transcaucasia, killed, in a duel, a man named Peschkoff, who was her lover. The sudden grief at losing the man she loved caused a second calenture of the brain, and, war being declared against Turkey just at that time, she joined the Red Cross Sisters, and went to the front to aid the wounded. I have since remembered that one evening, while before Plevna, I was passing through the camp hospital with Alexandrovitch, when he related to me his little escapade, explaining with happy, careless jest how recklessly he had flirted, and how foolishly jealous Peschkoff had been. He told me that it was an Englishman who had been travelling for pleasure to Teheran, but whose name he did not remember, that had really been the cause of the quarrel, and laughed heartily, with a Russian's pride of swordsmanship, as he narrated how evenly matched Peschkoff and he had been. That just cost my friend his life, for Darya must have overheard. Then the desire for revenge, the mad, insatiable craving for blood that had remained dormant, was again aroused; and, under the weird circumstances already described, she disguised herself as a man, and, entering our tent, murdered Alexandrovitch. On further investigation, I discovered that the unknown English traveller was none other than George Travers, for in one of the sketchbooks he had carried during his tour in the East, I found a well-executed pencil portrait of the Cossack maiden. Darya's motive in coming to England was, without doubt, one of revenge, prompted by the terrible aberration from which she was suffering. Mabel, who had refrained from saying anything regarding the murder of her brother, fearing lest her story should appear absurd, now made an explanation. On the night of the tragedy, she was on her way to the house at Chiswick, and, when near the gates, a well-dressed young man had accosted her, explaining that he was an old friend of George's recently returned from abroad, and wished to speak with him privately without his wife's knowledge. He concluded by asking her whether, as a favour, she would show him the way to enter her brother's room without going in at the front door. The story told by the young man seemed quite plausible, and she led him up to the French windows of the study. Then she left the stranger, and crossed the lawn to go round to the front door, but at that moment the clock of Chiswick church chimed, and, finding the hour so late, she suddenly resolved to return home. Later, when she heard of the tragedy, she was horrified to discover that she had actually aided the assassin, but resolved to preserve silence lest suspicion might attach itself to her.