Cary jumped up and went to his dining-room, where the visitor was waiting. The name had meant nothing to him, but the instant his eyes fell upon Mr. Dawson he remembered that he was the chief Scotland Yard officer who had come north to teach the local police how to keep track of the German agents who infested the shipbuilding centres. Cary had met Dawson more than once, and had assisted him with his intimate local knowledge. He greeted his visitor with smiling courtesy, but Dawson did not smile. His first words, indeed, came like shots from an automatic pistol. "Mr. Cary," said he, "I want to see your Naval Notes." Cary was staggered, for the three people whom I have mentioned did not include Mr. Dawson. "Certainly," said he, "I will show them to you if you ask officially. But how in the world did you hear anything about them?" "I am afraid that a good many people know about them, most undesirable people too. If you will show them to me--I am asking officially--I will tell you what I know." Cary led the way to his study. Dawson glanced round the room, at the papers heaped upon the table, at the tall windows bare of curtains--Cary, who loved light and sunshine, hated curtains--and growled. Then he locked the door, pulled down the thick blue blinds required by the East Coast lighting orders, and switched on the electric lights though it was high noon in May. "That's better," said he. "You are an absolutely trustworthy man, Mr. Cary. I know all about you. But you are damned careless. That bare window is overlooked from half a dozen flats. You might as well do your work in the street." Dawson picked up some of the papers, and their purport was explained to him by Cary. "I don't know anything of naval details," said he, "but I don't need any evidence of the value of the stuff here. The enemy wants it, wants it badly; that is good enough for me." "But," remonstrated Cary, "no one knows of these papers, or of the use to which I am putting them, except my son in the Navy, my wife (who has not read a line of them), and my publisher in London." "Hum!" commented Dawson. "Then how do you account for this?" He opened his leather despatch-case and drew forth a parcel carefully wrapped up in brown paper. Within the wrapping was a large white envelope of the linen woven paper used for registered letters, and generously sealed. To Cary's surprise, for the envelope appeared to be secure, Dawson cautiously opened it so as not to break the seal which was adhering to the flap and drew out a second smaller envelope, also sealed. This he opened in the same delicate way and took out a third; from the third he drew a fourth, and so on until eleven empty envelopes had been added to the litter piled upon Cary's table, and the twelfth, a small one, remained in Dawson's hands.