Jones produced his own notebook. “I began surveillance of the Farm Street house at seven A.M. this morning. By mid-morning, it became apparent to me that the house was not occupied, except by a cleaning lady who arrived at eight and departed at ten, so I had my man go in and wire the place for sound while I stood guard. He was out by one P.M., and now all the phones serve as taps for us, whether they are in use or not. The microphones are voice-activated and are recorded automatically by a machine in a garage about forty meters from the house. I’ll check it daily for anything of interest.

“I continued my surveillance of the house, and a little after three P.M. Mr. Cabot and Miss Burroughs returned and went into the house with some luggage. Less than an hour later, two men arrived outside in a car and knocked at the door. They were large gentlemen, and in spite of extensive tailoring and barbering, they struck me as right out of the East End. They rang the bell, and when Mr. Cabot emerged, they pulled him out of the house and began to rough him up, in the manner, I would say, of debt collectors for a loan shark or a bookmaker. Since I assumed you did not wish the man harmed, I approached, identified myself as a police officer, and asked Mr. Cabot if he required any assistance.

“He said he did not. I asked if he wished to make a charge against either or both of the gentlemen; he said he did not. I took the gentlemen aside and suggested that if I caught them in the neighborhood again I would have them in the nick very shortly. They got into their car and left. By this time, Mr. Cabot was already back inside the house.

“I then went to the garage and listened to the tape recording of what was said in the house. Miss Burroughs asked Mr. Cabot who had been at the door, and he replied, quite coolly, I thought, that some people had knocked at the wrong door. After that their conversation was of a mundane nature, and I reset the recorder. I waited within sight of the house until it was time to come here and see you.”

“Very good, Bobby,” Stone said. “Were you able to overhear any of the conversation between Cabot and the two men?”

“No, I’m afraid I was out of earshot. I expect they might be leery of returning to the house, but if they should telephone Cabot, we’ll have a recording of the conversation.”

“Do you have any further instructions for us, Mr. Barrington?” Cricket asked.