ily would have been conclusively successful. The police in their researches were dealing dogmatically with the evidential appearances of the crime, whereas the operations of the criminal were being conducted on a plane quite beyond the comprehension of the ordinary investigator.
This man who, after weeks of sedulous and disheartening analysis, eventually ferreted out the source of the horror, was a young social aristocrat, an intimate friend of John F.-X. Markham, the District Attorney. His name I am not at liberty to divulge, but for the purposes of these chronicles I have chosen to call him Philo Vance. He is no longer in this country, having transferred his residence several years ago to a villa outside of Florence; and, since he has no intention of returning to America, he has acceded to my request to publish the history of the criminal cases in which he participated as a sort of amicus curiæ. Markham also has retired to private life; and Sergeant Ernest Heath, that doughty and honest officer of the Homicide Bureau who officially handled the Greene case for the Police Department, has, through an unexpected legacy, been able to gratify his life's ambition to breed fancy wyandottes on a model farm in the Mohawk Valley. Thus circumstances have made it possible for me to publish my intimate records of the Greene tragedy.
A few words are necessary to explain my own participation in the case. (I say "participation," though, in reality, my rôle was that of passive spectator.) For several years I had been Vance's personal attorney. I had resigned from my father's law firm—Van Dine, Davis & Van Dine—in order
