"Little night walks in the fog for the benefit of your health ?" A puzzled frown gathered on Milburgh's face.
"Exercise, Mr.Tarling ?" he said with an air of mystification.

"I don't quite understand you.

Naturally I shouldn't walk out on a night like this.

What an extraordinary fog for this time of the year!" "Do you know Paddington at all ?" "No," said Mr.Milburgh, "except that there is a station there which I sometimes use.

But perhaps you will explain to me the meaning of this visit ?" "The meaning is," said Tarling shortly, "that I have been attacked to-night by a man of your build and height, who fired twice at me at close quarters.