"I'll fix you--you brute!" screamed Bridgers, "get away from him--ah!" Beale's hand flew up, a pencil of flame quivered and again the vault trembled to the deafening report. But Bridgers had dropped to cover. Again he shot, this time with unexpected effect. The bullet struck the fuse-box on the opposite wall and all the lights went out. Beale was still holding the glass tube, and this Milsom had seen. Quick as thought he hurled himself upon the detective, his big, powerful hands gripped the other's wrist and wrenched it round. Beale set his teeth and manoeuvred for a lock grip, but he was badly placed, pressed as he was against the edge of the bench. He felt van Heerden's fingers clawing at his hand and the tube was torn away. Then somebody pulled the revolver from the other hand and there was a scamper of feet. He groped his way through the blackness and ran into the pile of boxes. A bullet whizzed past him from the half-crazy Bridgers, but that was a risk he had to take. He heard the squeak of an opening door and stumbled blindly in its direction. Presently he found it. He had watched the other men go out and discovered the steps--two minutes later he was in the street. There was no sign of either of the two men. He found a policeman after he had walked half a mile, but that intelligent officer could not leave his beat and advised him to go to the police station. It was an excellent suggestion, for although the sergeant on duty was wholly unresponsive there was a telephone, and at the end of the telephone in his little Haymarket flat, a Superintendent McNorton, the mention of whose very name galvanized the police office to activity. "I have found the factory I've been looking for, McNorton," said Beale. "I'll explain the whole thing to you in the morning. What I want now is a search made of the premises." "We can't do that without a magistrate's warrant," said McNorton's voice, "but what we can do is to guard the premises until the warrant is obtained. Ask the station sergeant to speak on the 'phone--by the way, how is Miss Cresswell, better, I hope?" "Much better," said the young man shortly. It was unbelievable that she could ever fill his heart with the ache which came at the mention of her name. He made way for the station sergeant and later accompanied four men back to the laboratory. They found all the doors closed. Beale scaled the wall but failed to find a way in. He rejoined the sergeant on the other side of the wall. "What is the name of this street?" he asked. "Playbury Street, sir--this used to be Henderson's Wine Vaults in my younger days." Beale jotted down the address and finding a taxi drove back to the police station, wearied and sick at heart.