“What do you want to know?”

“All that there is to be known about Oberzohn. I may have missed one or two things. I’ve seen him outside the house. Oberzohn employs him for odd jobs and occasionally he acts as the old man’s chauffeur. In fact, he drove the machine the day Miss Leicester lunched with Oberzohn at the Ritz-Carlton. He may not have a cabman’s licence, and that will make it all the easier for you.”

A few minutes later, a very surprised and wrathful man was marched into Cannon Row and scientifically searched. Leon had been right about the revolver; it was produced and found to be loaded, and his excuse that he carried the weapon as a protection following upon a recent murder of a cab-driver, had not the backing of the necessary permit. In addition—and this was a more serious offence—he held no permit from Scotland Yard to ply for hire on the streets, and his badge was the property of another man.

“Put him inside,” said Meadows, and went back to report to the waiting Leon. “You’ve hit the bull’s-eye first time. I don’t know whether he will be of any use to us, but I don’t despise even the smallest fish.”

Whilst he was waiting, Leon had been engaged in some quick thinking.

“The man has been at Greenwich lately. One of my men saw him there twice, and I needn’t say that he was driving Oberzohn.”

“I’ll talk to him later and telephone you,” said Meadows, and Leon Gonsalez went back to Curzon Street, one large smile.

“You have merely exchanged a spy you know for a spy you don’t know,” said George Manfred, “though I never question these freakish acts of yours, Leon. So often they have a trick of turning up trumps. By the way, the police are raiding the Gringo Club in the Victoria Dock Road to-night, and they may be able to pick up a few of Mr. Oberzohn’s young gentlemen who are certain to be regular users of the place.”

The telephone bell rang shrilly, and Leon took up the receiver, and recognized Meadows’ voice.

“I’ve got a queer story for you,” said the inspector immediately.