The Dain Curse by Dashiell Hammett

At the Nob Hill address Halstead had given me, I told my name to the boy at the switchboard and asked him to pass it on to Fitzstephan. I remembered Fitzstephan as a long, lean, sorrel-haired man of thirty-two, with sleepy gray eyes, a wide, humorous mouth, and carelessly worn clothes; a man who pretended to be lazier than he was, would rather talk than do anything else, and had a lot of what seemed to be accurate information and original ideas on any subject that happened to come up, as long as it was a little out of the ordinary.

I had met him five years before, in New York, where I was digging dirt on a chain of fake mediums who had taken a coal-and-ice dealer's widow for a hundred thousand dollars. Fitzstephan was plowing the same field for literary material. We became acquainted and pooled forces. I got more out of the combination than he did, since he knew the spook racket inside and out; and, with his help, I cleaned up my job in a couple of weeks. We were fairly chummy for a month or two after that, until I left New York.