He knows the city well, ay, and Westminster, too, and the purlieus of Saint James's, and whether you want to meet young gallants or roistering blades, or to have a look in at places where you can hire a man to cut another's throat for a few crowns, he can show you them.

He will be on duty now, but I will send him a message to come round this evening, and I warrant me he will be here.

He has showed young squires from the country over the town before this, and will guess what is on hand when he gets my message." Having nothing to do, Charlie sauntered about the town during the day, looking into the shops, and keeping a keen eye on passers by, with the vague hope that he might be lucky enough to come across his man.
After he had finished his supper, the waiter came up and told him that his brother was outside.
"I have spoken to him, sir, and he warrants that he can take you into the sort of society you want to meet, whatever it may be." Charlie followed him out.

A man was standing under the lamp that swung before the door.
"This is the gentleman I was speaking to you of, Tony." As the man took off his cap, Charlie had a good view of his face.
It was shrewd and intelligent.
"You understand what I want ?" he asked, as the waiter ran into the house again, to attend to his duties.
"Yes, sir.

So far as I understood him, you wish to go to taverns of somewhat inferior reputations, and to see something of that side of London life.