We had ascended the kitchen stair and entered the suite of rooms upon the first floor. One was a dining-room, severely furnished and containing nothing of interest. A second was a bedroom, which also drew blank. The remaining room appeared more promising, and my companion settled down to a systematic examination. It was littered with books and papers, and was evidently used as a study. Swiftly and methodically Holmes turned over the contents of drawer after drawer and cupboard after cupboard, but no gleam of success came to brighten his austere face. At the end of an hour he was no further than when he started.

“The cunning dog has covered his tracks,” said he. “He has left nothing to incriminate him. His dangerous correspondence has been destroyed or removed. This is our last chance.”

It was a small tin cash-box which stood upon the writing-desk. Holmes pried it open with his chisel. Several rolls of paper were within, covered with figures and calculations, without any note to show to what they referred. The recurring words, “water pressure” and “pressure to the square inch” suggested some possible relation to a submarine. Holmes tossed them all impatiently aside. There only remained an envelope with some small newspaper slips inside it. He shook them out on the table, and at once I saw by his eager face that his hopes had been raised.

“What’s this, Watson? Eh? What’s this? Record of a series of messages in the advertisements of a paper. Daily Telegraph agony column by the print and paper. Right-hand top corner of a page. No dates - but messages arrange themselves. This must be the first:

“Hoped to hear sooner. Terms agreed to. Write fully to address given on card.

“PIERROT.

“Next comes:

“Too complex for description. Must have full report. Stuff awaits you when goods delivered.

“PIERROT.

“Then comes:

“Matter presses. Must withdraw offer unless contract completed. Make appointment by letter. Will confirm by advertisement.

“PIERROT.

“Finally:

“Monday night after nine. Two taps. Only ourselves. Do not be so suspicious. Payment in hard cash when goods delivered.

“PIERROT.

“A fairly complete record, Watson! If we could only get at the man at the other end!” He sat lost in thought, tapping his fingers on the table. Finally he sprang to his feet.

“Well, perhaps it won’t be so difficult, after all. There is nothing more to be done here, Watson. I think we might drive round to the offices of the Daily Telegraph, and so bring a good day’s work to a conclusion.”

Mycroft Holmes and Lestrade had come round by appointment after breakfast next day and Sherlock Holmes had recounted to them our proceedings of the day before. The professional shook his head over our confessed burglary.

“We can’t do these things in the force, Mr. Holmes,” said he. “No wonder you get results that are beyond us. But some of these days you’ll go too far, and you’ll find yourself and your friend in trouble.”

“For England, home and beauty - eh, Watson? Martyrs on the altar of our country. But what do you think of it, Mycroft?”

“Excellent, Sherlock! Admirable! But what use will you make of it?”

Holmes picked up the Daily Telegraph which lay upon the table.

“Have you seen Pierrot’s advertisement to-day?”

“What? Another one?”

“Yes, here it is:

“To-night. Same hour. Same place. Two taps. Most vitally important. Your own safety at stake.

“PIERROT.

“By George!” cried Lestrade. “If he answers that we’ve got him!”