Somebody was in the room with him. Somebody was moving stealthily along the wall at the opposite side of the apartment. T. B. waited for a moment to locate his man, then leapt noiselessly in the direction of the sound. His strong hands grasped a man's shoulder; another instant and his fingers were at the spy's throat. "Utter a word and I'll knock your head off!" he hissed. No terrible threat when uttered facetiously, but T. B.'s words were the reverse of humorous. Retaining a hold of his prisoner, he waited until the noise of a door closing told him that the diners in the next room had departed, then he dragged his man to where he judged the electric-light switch would be. His fingers found the button, turned it, and the room was instantly flooded with light. He released the man with a little push, and stood with his back to the door. "Now, sir," said T. B. virtuously; "will you kindly explain what you mean by spying on me?" The man was tall and thin. He was under thirty and decently dressed; but it was his face that held the detective's attention. It was the face of a man in mortal terror--the eyes staring, the lips tremulous, the cheeks lined and seamed like an old man's. He stood blinking in the light for a moment, and when he spoke he was incoherent and hoarse. "You're T. B. Smith," he croaked. "I know you; I've been wanting to find you." "Well, you've found me," said the detective grimly. "I wasn't looking for you--now. I'm Hyatt." He said this simply enough. It was the detective's turn to stare. "I'm Hyatt," the man went on; "and I've a communication to make; King's evidence; but you've got to hide me!" He came forward and laid his hand on the other's arm. "I'm not going to be done in like Moss; it's your responsibility, and you'll be blamed if anything happens to me," he almost whispered in his fear. "They've had Moss, and they'll try to have me. They've played me false because they thought I'd get to know the day the barrage was to be handed over, and spoil their market. They brought me up to London, because I'd have found out if I'd been in Cornwall----" "Steady, steady!" T. B. checked the man. He was talking at express rate, and between terror and wrath was well-nigh incomprehensible. "Now, begin at the beginning. Who are 'they'?" "N.H.C, I told you," snarled the other impatiently. "I knew they were going to get the date from the banker. That was the scheme of Catherine Dominguez. She is one of the agents--they've got 'em everywhere. She was introduced to his nephew so that she might get at the uncle. But I'm giving King's evidence. I shall get off; shan't I?" His anxiety was pitiable. T. B. thought quickly. Here were two ends to the mystery; which was the more important? He decided. This man would keep; the urgent business was to prevent Catherine from communicating her news to her friends.