"You are well acquainted with the neighbourhood?"
"Fairly well. But actually of course I am a stranger to London."
I tapped him confidentially upon the breast.
"Take my advice, as a friend," I said, "and visit these parts as rarely as possible."
"Why do you say that?"
"It is dangerous. From the friendly manner in which you entered into conversation with me, I perceived that you were of a genial and unsuspicious nature. Very well. I warn you. Last night I was followed from a certain street not far from here to the house of a medical man who is a specialist in certain kinds of criminology, you understand."
He stared at me very hard, his teeth bared by that fearful snarl. "You are a strange cabman."
"Perhaps I am. No matter. Take my advice. I have things written here"—I tapped the breast of my tunic—"which will astonish all the world shortly. I tell you, my friend, my fortune is made."
I finished my drink and ordered another for myself and one for my acquaintance. He was watching me doubtfully. Taking up my replenished glass, I emptied it at a draught and ordered a third. I leaned over towards the scarred man, resting my hand heavily upon his shoulder.
"Five thousand pounds," I whispered thickly, "has been offered for the information which I have here in my pocket. It is not yet complete, you understand, and because they may murder me before I obtain the rest of the facts, do you know what I am going to do with this?"