At the head of the letter he put no address.

"Dear Doctor," he wrote, "our plans are threatened. The new officer here, Lieutenant Treves, has been watching me closely for the past week. He has cross-examined Ewins about the guns, and evidently knows something. To-day a second officer has arrived, a Captain Sinclair. I doubt him also. They both suspect me. But my important news is that to-night I secured my first opportunity of going through Treves's belongings. I was able to open his dispatch-box, and among other papers of no importance, I discovered a letter from Cherriton, with whom he has apparently some association. The letter was signed by Cherriton, which clearly showed me that Treves is playing both for and against us. I have suspected him for days. I implore you, doctor, to probe this matter. If you hear no more from me you will know that things have gone wrong. I beg of you to act drastically and immediately.—S."

When "Crumbs" had finished this letter he read it carefully through and avoided blotting it, so that there could be no trace of its existence. When the letter had dried he placed it in an envelope and addressed it to "Dr. Voules, Rollo Meads, Brooke."

It was the custom at Heatherpoint for the fort letters to be sent to Freshwater post office every night at seven precisely in a locked bag. "Crumbs," with his letter in his pocket, hovered about the orderly-room until the bugle began to blow seven. He then hurriedly followed the orderly into the mess-room, where the adjutant nightly locked the bag with his key. Lieutenant Parkson was in the act of locking the bag when "Crumbs" shambled into the little room with an apology. He handed his letter to Parkson, who dropped it in and locked the bag.

CHAPTER XVI

John decided to walk into Freshwater, and then take the train to Newport. As he made his way along the road from Heatherpoint, carrying a small handbag, a red bicycle came towards him.

"Are you going to the fort?" he asked the telegraph boy.

"Yes, sir."

"Anything for Treves?"

The boy nodded.