"You shall see." The cab pulled up in front of a very ordinary-looking cafe in a side street leading from one of the boulevards.

Louis dismissed the man and looked for a moment or two up and down the pavement.

His caution appeared to be quite needless, for the thoroughfare was none too well lit, and it was almost empty.

Then he entered the cafe, motioning me to follow him.
"Don't look around too much," he whispered.

"There are many people here who do not care to be spied upon." My first glance into the place was disappointing.