Fauville, his son Edmond, his wife Marie, and his cousin Gaston Sauverand.
"With Cosmo Mornington, the thing was easy enough. Introducing himself to the American as a doctor, Jean Vernocq put poison into one of the phials which Mornington used for his hypodermic injections.
"But in the case of Hippolyte Fauville, whose good will he had secured through his acquaintance with old Langernault, and over whose mind he soon obtained an extraordinary influence, he had a greater difficulty to contend with. Knowing on the one hand that the engineer hated his wife and on the other that he was stricken with a fatal disease, he took occasion, after the consultation with the specialist in London, to suggest to Fauville's terrified brain the incredible plan of suicide of which you were subsequently able to trace the Machiavellian execution.
"In this way and with a single effort, anonymously, so to speak, and without appearing in the business, without Fauville's even suspecting the action brought to bear upon him, Jean Vernocq procured the deaths of Fauville and his son, and got rid of Marie and Sauverand by the devilish expedient of causing the charge of murder, of which no one could accuse him, to fall upon them. The plan succeeded.
"There was only one hitch at the present time: the intervention of Inspector Vérot. Inspector Vérot died. And there was only one danger in the future: the intervention of myself, Don Luis Perenna, whose conduct Vernocq was bound to foresee, as I was the residuary legatee by the terms of Cosmo Mornington's will. This danger Vernocq tried to avert first by giving me the house
