"We got it from one of Dr. Bird's assistants. His name--" * * * * * As he spoke the last few sentences, Karuska's voice had steadily risen almost to a shriek. As he endeavored to give the name of the doctor's treacherous helper his voice changed to an unintelligible screech and then died away into silence. Major Martin stepped forward and bent over the prone figure. Hurriedly he tore away the electrical connections and placed a stethoscope over the Russian's heart. He listened for a moment and then straightened up, his face pale. "I hope that the information you obtained is worth a life, Dr. Bird," he said, his voice trembling slightly, "because it has cost one." "It may easily save thousands of lives. I thank you, Major, and I will see that no blame attaches to you for your actions. I only wish that he had lived long enough to tell me the name of my assistant who has sold me to Saranoff. However, we'll get that information in other ways. Carnes, telephone Lawson at Atlanta to slam O'Grady into a cell pending investigation while I get Camp Meade on the wire and order up a couple of tanks. We are going to attack that gun emplacement at daybreak." The telephone bell in the laboratory jangled sharply. Major Martin answered it and turned to Carnes. "You're wanted on the telephone, Mr. Carnes." The detective stepped forward and took the transmitter. "Carnes speaking," he said. "Yes. Oh, hello, Bolton. Yes, we have Karuska here, or rather his body. Yes, Dr. Bird is here right now. You've what? Great Scott, wait a minute." "Dr. Bird," he cried eagerly turning from the telephone, "Bolton has located the Washington headquarters of the Young Labor party." Dr. Bird sprang to the instrument. "Bird speaking, Bolton," he cried. "You've located their headquarters? Who's running it? Stanesky, eh? You're on the right track; he used to be Saranoff's right hand man. Where is the place located? I don't seem to recollect the spot. You have it well surrounded? Where are you speaking from? All right, we'll join you as quickly as we can. Keep your patrols out and don't let anyone get away." He hung up the receiver and turned to Carnes. "Did you have the car wait?" he asked. "Good enough; we'll jump for the Bureau and pick up all the vitrilene laying around loose and then join Bolton. He thinks that he has the whole outfit bottled up." * * * * * Bolton was waiting as the car rolled up and Dr. Bird leaped out. "Where are they?" demanded the doctor eagerly.