“Listen, and I’ll let you into the secret,” said my friend, casting himself lazily into a chair. “The man you knew as Souvaroff was, until about six years ago, wealthy and popular at our Court at Petersburg; but he was suspected of political intrigue, and sentenced to lifelong exile and hard labour in Siberia. After his banishment, Prascovie, who was then living at Moscow, was detected by the police distributing some revolutionary pamphlets, for which she also was sent to Siberia. At the prison at Irkutsk father and daughter met. While there, Prince Pàvlovitch Kostomâroff, the governor of the Yeniseisk province, who had previously known and admired la belle Souvaroff in Petersburg society, discovered her, and offered her marriage. This she accepted, and they were married privately, because, had it become known that the Prince had wedded a political exile, he would have fallen into disfavour with the Tzar. The Prince not being governor of the province in which his wife was imprisoned, a difficulty presented itself how he should obtain her release. Even Ivan Kobita, controller of the prison, was ignorant of the secret union, but it so happened that he also became enamoured of his fair captive. At length, in return for her promise to marry him, he allowed her and her father comparative freedom. As might be expected, they were not long in taking advantage of this, for within a fortnight, aided by the Prince, and provided with a passport obtained by him, they managed to escape and come to England.”

“And what of Kobita?”

“He quickly discovered the ruse, and ascertained that the Prince had connived at their escape. Our Secret Police tracked the fugitives to their hiding-place in London. Still unaware that she was the Prince’s wife, Kobita obtained leave of absence and came to England. Before his arrival, however, he wrote, urging her to marry him, declaring that if she refused, he would expose the Prince as aiding and abetting dangerous Nihilists. Prascovie, who clearly saw that if the truth reached the Tzar, her husband would be disgraced and deprived of liberty, was at her wits’ ends. She was in desperation when, two years ago, Kobita arrived in London—”

“Was that on the night I called upon them?”

“Yes. It was on receipt of the letter from Kobita that Souvaroff sent for you and requested you to put the obituary notice in the papers, in order that when the Siberian official came to claim his daughter’s hand, he could convince him of her death. But this plan was not carried out quickly enough. Kobita arrived on the night of your visit, and was received by Prascovie’s father, who stated that she had gone to call upon a friend in the vicinity, and offered to send his servant to direct him to the house in question. To this Prascovie’s admirer had no objection, and, shaking Souvaroff warmly by the hand, wished him au revoir, and started off, accompanied by the servant, in search of the imaginary neighbour. The hand-shaking proved fatal, for he had not walked far before he fell dead. The whole thing had been carefully planned, and the trusty servant, who had been instructed how to act, extracted everything from the dead man’s pockets that would lead to identification. Hence his burial in a nameless grave.”

“Do you assert that he was murdered?”

“Yes. We were in possession of all these facts, but refrained from causing Souvaroff’s arrest, because it was not a wise policy to expose to the London public that Russia had established a bureau of secret police in their midst. Prascovie and her father hid for some months, and we lost sight of them until she called upon you, and accompanied you in disguise to Siberia. Once or twice you very narrowly escaped being apprehended; indeed, on one occasion orders were telegraphed to Tomsk for the arrest of your companion and yourself, because the declaration on your passport regarding ‘Ivan Ivanovitch’ was known to be false. By the intervention of a high official, however, the order was countermanded, and you were allowed to pass.”

“What has become of Prascovie’s father?” I asked in astonishment. “Surely he was not Kobita’s murderer, for the man died of heart disease.”

“You are mistaken. He died of Obeah poison. Souvaroff, who was once a consul in Hayti, knew of the secret poison which the natives extract from the gecko lizard, and which cannot be detected. So deadly is it, that one drop is sufficient to produce a fatal result, and the manner in which he administered it was somewhat novel. He prepared to receive his enemy by allowing the nail of the forefinger of his right hand to grow long, afterwards thinning it to a point as fine as a needle. Upon this point he placed the poison, and kept a glove on until Kobita’s arrival. Then, in wishing him adieu, he pricked the skin of his victim while shaking hands with him, producing an effect similar to syncope.”

“Where is Souvaroff now?”