The Lost House by Richard Harding Davis

"Prothero," said Cuthbert, "is a man of mystery. As soon as I began asking his neighbors questions, I saw he was of interest and that I was of interest. I saw they did not believe I was an agent of a West End shop, but a detective. So they wouldn't talk at all, or else they talked freely. And from one of them, a chemist named Needham, I got all I wanted. He's had a lawsuit against Prothero, and hates him. Prothero got him to invest in a medicine to cure the cocaine habit. Needham found the cure was no cure, but cocaine disguised. He sued for his money, and during the trial the police brought in Prothero's record. Needham let me copy it, and it seems to embrace every crime except treason. The man is a Russian Jew. He was arrested and prosecuted in Warsaw, Vienna, Berlin, Belgrade; all over Europe, until finally the police drove him to America. There he was an editor of an anarchist paper, a blackmailer, a 'doctor' of hypnotism, a clairvoyant, and a professional bigamist. His game was to open rooms as a clairvoyant, and advise silly women how to invest their money. When he found out which of them had the most money, he would marry her, take over her fortune, and skip. In Chicago, he was tried for poisoning one wife, and the trial brought out the fact that two others had died under suspicious circumstances, and that there were three more unpoisoned but anxious to get back their money. He was sentenced to ten years for bigamy, but pardoned because he was supposed to be insane, and dying. Instead of dying, he opened a sanatorium in New York to cure victims of the drug habit. In reality, it was a sort of high-priced opium-den.

The place was raided, and he jumped his bail and came to this country. Now he is running this private hospital in Sowell Street. Needham says it's a secret rendezvous for dope fiends. But they are very high-class dope fiends, who are willing to pay for seclusion, and the police can't get at him. I may add that he's tall and muscular, with a big black beard, and hands that could strangle a bull. In Chicago, during the poison trial, the newspapers called him 'the Modern Bluebeard."