The note was written, and Martin Hewitt, without glancing at the address, thrust it into his pocket. When Ritter was safely in the inner office, however, he drew it out and read the address. "I see," he observed, "he uses the same name, Hunter; 27, Little Carton Street, Westminster, is the address, and there I shall go at once with the note. If the man comes here, I think you had better lock him in with Ritter, and send for a policeman--it may at least frighten him. My object is, of course, to get the man away, and then, if possible, to invade his house, in some way or another, and steal or smash his negatives if they are there and to be found. Stay here, in any case, till I return. And don't forget to lock up those tracings." * * * * * It was about six o'clock when Hewitt returned, alone, but with a smiling face that told of good fortune at first sight. "First, Mr. Dixon," he said, as he dropped into an easy chair in the private room, "let me ease your mind by the information that I have been most extraordinarily lucky--in fact, I think you have no further cause for anxiety. Here are the negatives. They were not all quite dry when I--well, what?--stole them, I suppose I must say; so that they have stuck together a bit, and probably the films are damaged. But you don't mind that, I suppose?" He laid a small parcel, wrapped in newspaper, on the table. The engineer hastily tore away the paper and took up five or six glass photographic negatives, of the half-plate size, which were damp, and stuck together by the gelatine films, in couples. He held them, one after another, up to the light of the window, and glanced through them. Then, with a great sigh of relief, he placed them on the hearth and pounded them to dust and fragments with the poker. For a few seconds neither spoke. Then Dixon, flinging himself into a chair, said:-- "Mr. Hewitt, I can't express my obligation to you. What would have happened if you had failed I prefer not to think of. But what shall we do with Ritter now? The other man hasn't been here yet, by-the-bye." "No--the fact is, I didn't deliver the letter. The worthy gentleman saved me a world of trouble by taking himself out of the way." Hewitt laughed. "I'm afraid he has rather got himself into a mess by trying two kinds of theft at once, and you may not be sorry to hear that his attempt on your torpedo plans is likely to bring him a dose of penal servitude for something else. I'll tell you what has happened.