"What are we to do?" I asked.
"Well, of course, if you see Mayes in the open, grab him instantly. I needn't tell Plummer that. I think Plummer would naturally seize him on the spot, rush him off to the nearest station and go back with enough men to clear out No. 8 Norbury Row. If you don't see him you'll keep an observation, according to Plummer's discretion. But, unless some exceptional chance occurs, I hope you won't go rushing in till we communicate with each other—we must work together, and I may have news. My instinct seems to tell me that yours is the right end of the stick, at Barbican. But we must neglect nothing, and that is why I want you to hold on there while I make the necessary examination at the other end. Do you know this Norbury Row, Plummer?"
"I think I know every street and alley in the City," Plummer answered. "There is a very good publican at the corner of Norbury Row, who's been useful to the police a score of times. He keeps his eyes open, and I shall be surprised if he can't give us some information about No. 8, anyhow. Moon's his name, and the house is 'The Compasses.' I shall go there first. And if you've any message to send, send it through him. I'll tell him."
On the stairs Plummer and I encountered another
