 America's number one adventurer K-7 form a United States secret agent who operated in 22 countries on land on sea and in the air brings you a story of today. We take you to secret agent K-7's headquarters. This is K-7 speaking. Send in special agent M for assignment. Special agent M reporting for duty. Agent M, Marie Bignieu, a famous spy is active again. She was little more than a child during the World War. However, she was dangerous even then. After the war she married a French officer, a Captain Boulas, and dropped from sight. Last year her husband died. Coated messages from her have been found on two spies captured recently on the continent. We know nothing more except that she is somewhere in London. I want you and your assistant, Miss Durrell, to fly there tonight. Locate her, and if possible, make an arrest. Keep me informed. Marie Bignieu is active and in London. Agent M knew the job of locating her in the great city would be difficult unless a lead could be found in Paris. Wisely, he decided to spend that afternoon interviewing some of her dead husband's brother officers. Dear Madame, it was good to hear from you again and to know that your business is prospering. As you requested, I have written to Colonel Arvives and asked him to get in touch with you. Yes? Can I help you, Monsieur? I'm looking for Captain Farraghi. Has he lived here? But yes, I am Captain Farraghi. Come in, Monsieur. Thank you. Captain, my credentials. I'm looking for the wife of an officer who died last year, Madame Boulas. Do you know her? No, but of course I am writing her a letter now. She is in London. You are a special agent. Is anything wrong? Oh, no, Captain. Well, we'd like to have Madame Boulas do a favor for us. We want her address. I understand. Of course, Monsieur, it is here. Wait, I will write it out for you. Madame has a little book shop near the sand. Many of her husband's friends keep in touch with her. We place orders. You understand it is difficult for a widow. Yes. Here is the address. Thank you, Captain. Oh, you said you were writing to her. Now, the matter I wish to see her on is confidential. I would prefer that you not mention my visit here. When I see her, I will explain. It will be as you asked, Monsieur, this special agent. I understand the nature of your work. It is important to my country and to Madame's. I will not say that you call. The next morning, Agent M and his assistant, Yvonne, arrived in London. While Agent M waited in a car outside, Yvonne visited the small book shop owned by the woman who'd been a famous spy. She arrived as the woman talked in low tones with a man who stood idly turning the pages of a book. You are sure you can get this information we need? Have I ever failed? My plan is a simple one. I am a widow. My former husband's friends visit me. They are my friends. Is it not natural for the former wife of an officer to be interested in military affairs? And he'd only to show my interest. And I am told many things. Hmm. Not a clever woman, Monserbineau. Please, you must never use that name. I'm sorry. Many in the intelligence department remember Marie Benoux. My name is now Madame Boulard. You will call me by that name. Oh, but certainly as you wish. Now tell me, how soon can you get the information we need? If you will come back tonight it will be here. I am expecting an old colonel to visit me this afternoon. He likes to sit and talk. He will know and it won't be hard to persuade him to tell me. Good. I'll send one of my men before he'll close the shop. I have a customer. If your friend will come in and ask for a copy of Nana, I'm sure the book will please you. No, thank you. I'll wait until you get through with this girl. Hey, Monserbineau. Can I help you? I'm looking for a book for a friend. You don't mind if I look around? Of course not. I suggest that you look at these. Thank you. She will be gone in a minute. I know that girl. She is the assistant of Special Agent M. I shot him together in Switzerland. Now don't do anything until I return. Are you sure of what you have just said? Of course I'm positive. Now she doesn't know me. I'm going outside. When she leaves I'll follow her until you hear from me again. Don't attempt to get the information I ask for. Now I leave you. Goodbye. Thank you so much for calling. Thank you. Goodbye, madam. Outside, Agent M sat in his car and waited. As he watched the shop, he saw the spy who had been in the shop as he stepped into the street. M immediately guessed that Yvonne had been recognized. Without waiting he drove away. A minute later Yvonne came out. Finding M's car gone, she knew something was wrong and went immediately to her rooms. Two hours later M joined her. M? What happened? When I came out of the shop you were gone. You were followed, Yvonne. Did you see the man in the shop when you went in? Yes. He was talking with a woman who must be Marie Biennieu. They were in the back of the store. That man was Alex Crowe, a dangerous spy. He must have recognized you, Yvonne. He left the shop as soon as you came in. But he waited for you outside and followed you when you came out. Oh. Well then they must know way here. Yes, they probably suspect. Crowe didn't see me. I drove away as soon as he came out. Then I circled the block and followed him. You let him here. He made several inquiries about you and then went to his room. You followed him? Yes. Then I reported to K-7. He'll be followed wherever he goes from now on. Well, if they know we're here it will make it harder. Perhaps not. Marie Biennieu may attempt to finish whatever she's doing and leave the country. And if she does, we'll trap her. Did you overhear anything in the shop? Not much. They stopped talking when I entered. But I did hear a tell the man you called Crowe to send someone for the book Nanna. Late this afternoon. Someone was to ask for a copy of Nanna. Yes. The exact words were, if your friend will come in and ask for a copy of Nanna, I'm sure the book will please you. Yvonne, that information may be the key to our problem. Marie Biennieu has never seen me. You're going back to the shop. Yes, Yvonne. I'm going for a copy of Nanna. A few minutes later, agent AM entered the small book shop. It was almost closing time. Yes, Monsieur. I would like a copy of Nanna, please. Oh, you've come at an inopportune time, Monsieur. I have no copies of the book left. But I don't understand. Madame, are you sure? Monsieur Crowe instructed me to ask you for the book. He said that you would understand. Monsieur Crowe sent you? Well, yes, of course. Oh, I didn't know. If Monsieur will follow me, I have the book ready. All right, it is in them. Put your hands over your head. Fool. Did you think I would fall into your trap? Quite a surprise, Charlie. Did you arrange this, Crowe? Get his gun. Here it is. Now, this isn't going to be any party for you, agent AM. This time you're going to pay for your interference. I wouldn't be too sure. We'll have time to talk later. Get him off the back way. Who's that? Don't move. Either of you. K-7. All right, K-7. I've got my gun again. I was sure that as a result of my call to you, someone must have followed Crowe here. There was no one available, so I took the assignment myself, agent AM. You can't arrest me. I've done nothing. We have two coded messages that were signed by you, Marie. Didn't you? I think this book here that you've just left to send out of the country will also prove interesting. I'll open it, K-7. Yes. Here's the answer, K-7. A small pinprick is then made under words on each page. The words with punctures under them make up the message. These books were sent out as merchandise, but each one contained a secret message. A clever plan, ma'am Zell, but it didn't work. I arrest you and Crowe as spies. These have used marked books to send messages in many ways. Some spell out messages by making small pinpricks under words. Others mark letters. The pinpricks are so small as to be unnoticeable except under a magnifying glass. Other tricks used by spies will be exposed in future broadcasts. Listen for my next story. This is K-7 speaking.